drm: sti: Add missing dependency on RESET_CONTROLLER

Add missing dependency on RESET_CONTROLLER in order to fix
the following build error.

drivers/gpu/drm/sti/sti_hdmi.c: In function 'sti_hdmi_probe'
drivers/gpu/drm/sti/sti_hdmi.c:780:2: error: implicit declaration of function 'devm_reset_control_get'
[-Werror=implicit-function-declaration]

Benjamin Gaignard remark:
I have change "depends on" to "select" but keep the original author name.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>

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)
+	select RESET_CONTROLLER
 	select DRM_KMS_HELPER
 	select DRM_GEM_CMA_HELPER
 	select DRM_KMS_CMA_HELPER