MIPS: dts: Always descend vendor subdirectories

Commit 41528ba ("MIPS: DTS: Only build subdir of current platform")
broke building of all DTBs when CONFIG_OF_ALL_DTBS is enabled unless all
the various kconfig options were also enabled. The only effect that commit
had was getting rid of some harmless build lines such as:

      AR      arch/mips/boot/dts/mti/built-in.a

Those lines were part of the built-in DTB support. Since commit
04e4ec9 ("MIPS: migrate to generic rule for built-in DTBs"), how the
built-in DTBs are handled has changed and those lines are no longer
generated, so revert to the prior behavior.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

Author: robherring

arch/mips/boot/dts/Makefile

@@ -1,20 +1,17 @@
 # SPDX-License-Identifier: GPL-2.0
-subdir-$(CONFIG_BMIPS_GENERIC)		+= brcm
-subdir-$(CONFIG_CAVIUM_OCTEON_SOC)	+= cavium-octeon
-subdir-$(CONFIG_ECONET)			+= econet
-subdir-$(CONFIG_EYEQ)			+= mobileye
-subdir-$(CONFIG_FIT_IMAGE_FDT_MARDUK)   += img
-subdir-$(CONFIG_FIT_IMAGE_FDT_BOSTON)	+= img
-subdir-$(CONFIG_MACH_INGENIC)		+= ingenic
-subdir-$(CONFIG_LANTIQ)			+= lantiq
-subdir-$(CONFIG_MACH_LOONGSON64)	+= loongson
-subdir-$(CONFIG_MACH_LOONGSON32)	+= loongson
-subdir-$(CONFIG_SOC_VCOREIII)		+= mscc
-subdir-$(CONFIG_MIPS_MALTA)		+= mti
-subdir-$(CONFIG_LEGACY_BOARD_SEAD3)	+= mti
-subdir-$(CONFIG_FIT_IMAGE_FDT_NI169445)	+= ni
-subdir-$(CONFIG_MACH_PIC32)		+= pic32
-subdir-$(CONFIG_ATH79)			+= qca
-subdir-$(CONFIG_RALINK)			+= ralink
-subdir-$(CONFIG_MACH_REALTEK_RTL)	+= realtek
-subdir-$(CONFIG_FIT_IMAGE_FDT_XILFPGA)	+= xilfpga
+subdir-y	+= brcm
+subdir-y	+= cavium-octeon
+subdir-y	+= econet
+subdir-y	+= mobileye
+subdir-y	+= img
+subdir-y	+= ingenic
+subdir-y	+= lantiq
+subdir-y	+= loongson
+subdir-y	+= mscc
+subdir-y	+= mti
+subdir-y	+= ni
+subdir-y	+= pic32
+subdir-y	+= qca
+subdir-y	+= ralink
+subdir-y	+= realtek
+subdir-y	+= xilfpga

arch/mips/boot/dts/realtek/Makefile

@@ -1,3 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0
-dtb-y	+= cisco_sg220-26.dtb
-dtb-y	+= cameo-rtl9302c-2x-rtl8224-2xge.dtb
+dtb-$(CONFIG_MACH_REALTEK_RTL)	+= cisco_sg220-26.dtb
+dtb-$(CONFIG_MACH_REALTEK_RTL)	+= cameo-rtl9302c-2x-rtl8224-2xge.dtb