ARM: ux500: build ccu8540 device tree blob

This makes sure the new ccu8540 DTB file is generated by
the build system.

Cc: Lee Jones <lee.jones@linaro.org>
Cc: Gabriel Fernandez <gabriel.fernandez.st@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/Makefile

@@ -158,6 +158,7 @@ dtb-$(CONFIG_ARCH_PRIMA2) += prima2-evb.dtb
 dtb-$(CONFIG_ARCH_U8500) += snowball.dtb \
 	hrefprev60.dtb \
 	hrefv60plus.dtb \
+	ccu8540.dtb \
 	ccu9540.dtb
 dtb-$(CONFIG_ARCH_SHMOBILE) += emev2-kzm9d.dtb \
 	r8a7740-armadillo800eva.dtb \