drm/arm/hdlcd: Replace module initialization with DRM helpers

Replace module_platform_driver() with drm_module_platform_driver(). The
DRM macro respects drm_firmware_drivers_only() and fails if the flag has
been set.

Signed-off-by: Javier Martinez Canillas <[e-mail]>
Acked-by: Thomas Zimmermann <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/arm/hdlcd_drv.c

···
 #include <drm/drm_gem_cma_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
 #include <drm/drm_modeset_helper.h>
+#include <drm/drm_module.h>
 #include <drm/drm_of.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
···
 	},
 };
 
-module_platform_driver(hdlcd_platform_driver);
+drm_module_platform_driver(hdlcd_platform_driver);
 
 MODULE_AUTHOR("Liviu Dudau");
 MODULE_DESCRIPTION("ARM HDLCD DRM driver");