drm: Kconfig: Let all DRM_GEM_CMA_HELPER related macros depend on HAVE_DMA_ATTRS

DRM_GEM_CMA_HELPER is depend on HAVE_DMA_ATTRS, or it will break the
building. The related error (with allmodconfig under xtensa):

CC [M] drivers/gpu/drm/drm_gem_cma_helper.o
drivers/gpu/drm/drm_gem_cma_helper.c: In function 'drm_gem_cma_create':
drivers/gpu/drm/drm_gem_cma_helper.c:110:19: error: implicit declaration of function 'dma_alloc_writecombine' [-Werror=implicit-function-declaration]
cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
^
drivers/gpu/drm/drm_gem_cma_helper.c:110:17: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
cma_obj->vaddr = dma_alloc_writecombine(drm->dev, size,
^
drivers/gpu/drm/drm_gem_cma_helper.c: In function 'drm_gem_cma_free_object':
drivers/gpu/drm/drm_gem_cma_helper.c:193:3: error: implicit declaration of function 'dma_free_writecombine' [-Werror=implicit-function-declaration]
dma_free_writecombine(gem_obj->dev->dev, cma_obj->base.size,
^
drivers/gpu/drm/drm_gem_cma_helper.c: In function 'drm_gem_cma_mmap_obj':
drivers/gpu/drm/drm_gem_cma_helper.c:330:8: error: implicit declaration of function 'dma_mmap_writecombine' [-Werror=implicit-function-declaration]
ret = dma_mmap_writecombine(cma_obj->base.dev->dev, vma,
^

Signed-off-by: Chen Gang <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>

drivers/gpu/drm/Kconfig

···
 
 config DRM_GEM_CMA_HELPER
 	bool
-	depends on DRM
+	depends on DRM && HAVE_DMA_ATTRS
 	help
 	  Choose this if you need the GEM CMA helper functions
 
 config DRM_KMS_CMA_HELPER
 	bool
+	depends on DRM && HAVE_DMA_ATTRS
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_FB_HELPER
 	select FB_SYS_FILLRECT

drivers/gpu/drm/imx/Kconfig

···
 	select VIDEOMODE_HELPERS
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_CMA_HELPER
-	depends on DRM && (ARCH_MXC || ARCH_MULTIPLATFORM)
+	depends on DRM && (ARCH_MXC || ARCH_MULTIPLATFORM) && HAVE_DMA_ATTRS
 	depends on IMX_IPUV3_CORE
 	help
 	  enable i.MX graphics support

drivers/gpu/drm/rcar-du/Kconfig

···
 config DRM_RCAR_DU
 	tristate "DRM Support for R-Car Display Unit"
-	depends on DRM && ARM
+	depends on DRM && ARM && HAVE_DMA_ATTRS
 	depends on ARCH_SHMOBILE || COMPILE_TEST
 	select DRM_KMS_HELPER
 	select DRM_KMS_CMA_HELPER

drivers/gpu/drm/shmobile/Kconfig

···
 config DRM_SHMOBILE
 	tristate "DRM Support for SH Mobile"
-	depends on DRM && ARM
+	depends on DRM && ARM && HAVE_DMA_ATTRS
 	depends on ARCH_SHMOBILE || COMPILE_TEST
 	depends on FB_SH_MOBILE_MERAM || !FB_SH_MOBILE_MERAM
 	select BACKLIGHT_CLASS_DEVICE

drivers/gpu/drm/sti/Kconfig

···
 config DRM_STI
 	tristate "DRM Support for STMicroelectronics SoC stiH41x Series"
-	depends on DRM && (SOC_STIH415 || SOC_STIH416 || ARCH_MULTIPLATFORM)
+	depends on DRM && (SOC_STIH415 || SOC_STIH416 || ARCH_MULTIPLATFORM) && HAVE_DMA_ATTRS
 	select RESET_CONTROLLER
 	select DRM_KMS_HELPER
 	select DRM_GEM_CMA_HELPER

drivers/gpu/drm/tilcdc/Kconfig

···
 config DRM_TILCDC
 	tristate "DRM Support for TI LCDC Display Controller"
-	depends on DRM && OF && ARM
+	depends on DRM && OF && ARM && HAVE_DMA_ATTRS
 	select DRM_KMS_HELPER
 	select DRM_KMS_FB_HELPER
 	select DRM_KMS_CMA_HELPER