arch/arm/Makefile: sort machine names

The comment immediately above the block of machine directory names implored
users to keep the macro names sorted, but, alas, this is no longer the case.

Put the list of machine directory names back in alphanumerical order by
CONFIG_* macro name, as the comment asks. Sort all the symbols as though they
all followed the convention of having the string "ARCH_" in the middle of
their definitions.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 33bb892..5d32dec 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -66,25 +66,25 @@
 machine-$(CONFIG_ARCH_MEDIATEK)		+= mediatek
 machine-$(CONFIG_ARCH_MESON)		+= meson
 machine-$(CONFIG_ARCH_MVEBU)		+= mvebu
-# TODO: rename CONFIG_TEGRA -> CONFIG_ARCH_TEGRA
+machine-$(CONFIG_ARCH_OMAP2PLUS)	+= omap2
 # TODO: rename CONFIG_ORION5X -> CONFIG_ARCH_ORION5X
 machine-$(CONFIG_ORION5X)		+= orion5x
-machine-$(CONFIG_ARCH_OMAP2PLUS)	+= omap2
 machine-$(CONFIG_ARCH_OWL)		+= owl
-machine-$(CONFIG_ARCH_S5PC1XX)		+= s5pc1xx
-machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
-machine-$(CONFIG_ARCH_SNAPDRAGON)	+= snapdragon
-machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_ARCH_RMOBILE)		+= rmobile
 machine-$(CONFIG_ARCH_ROCKCHIP)		+= rockchip
+machine-$(CONFIG_ARCH_S5PC1XX)		+= s5pc1xx
+machine-$(CONFIG_ARCH_SNAPDRAGON)	+= snapdragon
+machine-$(CONFIG_ARCH_SOCFPGA)		+= socfpga
 machine-$(CONFIG_STM32)			+= stm32
 machine-$(CONFIG_ARCH_STM32MP)		+= stm32mp
+machine-$(CONFIG_ARCH_SUNXI)		+= sunxi
+# TODO: rename CONFIG_TEGRA -> CONFIG_ARCH_TEGRA
 machine-$(CONFIG_TEGRA)			+= tegra
 machine-$(CONFIG_ARCH_U8500)		+= u8500
 machine-$(CONFIG_ARCH_UNIPHIER)		+= uniphier
+machine-$(CONFIG_ARCH_VERSAL)		+= versal
 machine-$(CONFIG_ARCH_ZYNQ)		+= zynq
 machine-$(CONFIG_ARCH_ZYNQMP)		+= zynqmp
-machine-$(CONFIG_ARCH_VERSAL)		+= versal
 machine-$(CONFIG_ARCH_ZYNQMP_R5)	+= zynqmp-r5
 
 machdirs := $(patsubst %,arch/arm/mach-%/,$(machine-y))