accel/rocket: Depend on DRM_ACCEL not just DRM

With the current dependency on only DRM, a config of

CONFIG_DRM_ACCEL_ROCKET=y

is possible, but of course wrong, because without DRM_ACCEL the build-
system will never even enter drivers/accel/* .

So depend on DRM_ACCEL instead of just DRM.

Fixes: ed98261b4168 ("accel/rocket: Add a new driver for Rockchip's NPU")
Signed-off-by: Heiko Stuebner <[e-mail]>
Signed-off-by: Tomeu Vizoso <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/accel/rocket/Kconfig

···
 
 config DRM_ACCEL_ROCKET
 	tristate "Rocket (support for Rockchip NPUs)"
-	depends on DRM
+	depends on DRM_ACCEL
 	depends on (ARCH_ROCKCHIP && ARM64) || COMPILE_TEST
 	depends on ROCKCHIP_IOMMU || COMPILE_TEST
 	depends on MMU