mtd: MTD_INTEL_DG should depend on DRM_I915 or DRM_XE

Intel Discrete Graphics non-volatile memory is only present on Intel
discrete graphics devices, and its auxiliary device is instantiated by
the Intel i915 and Xe2 DRM drivers.  Hence add dependencies on DRM_I915
and DRM_XE, to prevent asking the user about this driver when
configuring a kernel without Intel graphics support.

Fixes: ceb5ab3 ("mtd: add driver for intel graphics non-volatile memory device")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

Author: geertu

drivers/mtd/devices/Kconfig

@@ -185,8 +185,8 @@ config MTD_POWERNV_FLASH
 
 config MTD_INTEL_DG
 	tristate "Intel Discrete Graphics non-volatile memory driver"
-	depends on AUXILIARY_BUS
-	depends on MTD
+	depends on AUXILIARY_BUS && MTD
+	depends on DRM_I915!=n || DRM_XE!=n || COMPILE_TEST
 	help
 	  This provides an MTD device to access Intel Discrete Graphics
 	  non-volatile memory.