kernel: fix builds with kmod-drm-vc4 and CONFIG_SPI enabled

This fixes:
Samsung LD9040 RGB/SPI panel (DRM_PANEL_SAMSUNG_LD9040) [N/m] (NEW) aborted!

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/generic/config-4.9

@@ -1081,8 +1081,10 @@ CONFIG_DQL=y
 # CONFIG_DRM_NXP_PTN3460 is not set
 # CONFIG_DRM_OMAP is not set
 # CONFIG_DRM_PANEL_JDI_LT070ME05000 is not set
+# CONFIG_DRM_PANEL_LG_LG4573 is not set
 # CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00 is not set
 # CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN is not set
+# CONFIG_DRM_PANEL_SAMSUNG_LD9040 is not set
 # CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0 is not set
 # CONFIG_DRM_PANEL_SHARP_LQ101R1SX01 is not set
 # CONFIG_DRM_PANEL_SHARP_LS043T1LE01 is not set