ARM: dts: aspeed: Sort ASPEED entries in makefile

In preperation for adding more boards.
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/boot/dts/Makefile

@@ -1101,7 +1101,8 @@ dtb-$(CONFIG_ARCH_MEDIATEK) += \
 	mt8127-moose.dtb \
 	mt8135-evbp1.dtb
 dtb-$(CONFIG_ARCH_ZX) += zx296702-ad1.dtb
-dtb-$(CONFIG_ARCH_ASPEED) += aspeed-bmc-opp-palmetto.dtb \
-	aspeed-bmc-opp-romulus.dtb \
-	aspeed-ast2500-evb.dtb
+dtb-$(CONFIG_ARCH_ASPEED) += \
+	aspeed-ast2500-evb.dtb \
+	aspeed-bmc-opp-palmetto.dtb \
+	aspeed-bmc-opp-romulus.dtb
 endif