BCM270X: Promote PANEL_RASPBERRYPI_TOUCHSCREEN to =y.

Without building it in, the module doesn't get autoloaded, for reasons
I haven't figured out.  Build it in for now so that we can get the
panel working at boot.

Author: anholt

arch/arm/configs/bcm2709_defconfig

@@ -818,11 +818,11 @@ CONFIG_VIDEO_TW9903=m
 CONFIG_VIDEO_TW9906=m
 CONFIG_VIDEO_OV7640=m
 CONFIG_VIDEO_MT9V011=m
-CONFIG_DRM=m
+CONFIG_DRM=y
 CONFIG_DRM_LOAD_EDID_FIRMWARE=y
 CONFIG_DRM_UDL=m
 CONFIG_DRM_PANEL_SIMPLE=m
-CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=m
+CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=y
 CONFIG_DRM_VC4=m
 CONFIG_FB=y
 CONFIG_FB_BCM2708=y

arch/arm/configs/bcmrpi_defconfig

@@ -810,11 +810,11 @@ CONFIG_VIDEO_TW9903=m
 CONFIG_VIDEO_TW9906=m
 CONFIG_VIDEO_OV7640=m
 CONFIG_VIDEO_MT9V011=m
-CONFIG_DRM=m
+CONFIG_DRM=y
 CONFIG_DRM_LOAD_EDID_FIRMWARE=y
 CONFIG_DRM_UDL=m
 CONFIG_DRM_PANEL_SIMPLE=m
-CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=m
+CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN=y
 CONFIG_DRM_VC4=m
 CONFIG_FB=y
 CONFIG_FB_BCM2708=y