arm64: virtconfig: Further shrink the config

After disabling platform support there's still some more pruning we can
do to the virtconfig size, there are a number of drivers and subsystems
which are not likely to be useful on mach-virt and so can be disabled in
order to further improve build times. Let's do so, noting that having PCI
device assignment means that PCI devices might potentially appear.

This is just an initial manual passthrough, there will be further savings
available especially if we take a much more focused approach.

Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnd Bergmann <[email protected]>

Author: broonie

arch/arm64/configs/virt.config

@@ -1,3 +1,7 @@
+#
+# Base options for platforms
+#
+
 # CONFIG_ARCH_ACTIONS is not set
 # CONFIG_ARCH_SUNXI is not set
 # CONFIG_ARCH_ALPINE is not set
@@ -37,3 +41,20 @@
 # CONFIG_ARCH_VISCONTI is not set
 # CONFIG_ARCH_XGENE is not set
 # CONFIG_ARCH_ZYNQMP is not set
+
+#
+# Subsystems which can't be used in mach-virt
+#
+# CONFIG_CHROME_PLATFORMS is not set
+# CONFIG_EXTCON is not set
+# CONFIG_IIO is not set
+# CONFIG_MTD is not set
+# CONFIG_NEW_LEDS is not set
+# CONFIG_PWM is not set
+# CONFIG_REGULATOR is not set
+# CONFIG_SLIMBUS is not set
+# CONFIG_SND_SOC is not set
+# CONFIG_SOUNDWIRE is not set
+# CONFIG_SPI is not set
+# CONFIG_SURFACE_PLATFORMS is not set
+# CONFIG_THERMAL is not set