mtd: enable AFS selection for ARM64

ARM use their special partitions also on the ARM64 architecture
reference designs, so enable this for ARM64.

Cc: Ryan Harkin <ryan.harkin@linaro.org>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/Kconfig

@@ -112,7 +112,7 @@ config MTD_CMDLINE_PARTS
 
 config MTD_AFS_PARTS
 	tristate "ARM Firmware Suite partition parsing"
-	depends on ARM
+	depends on (ARM || ARM64)
 	---help---
 	  The ARM Firmware Suite allows the user to divide flash devices into
 	  multiple 'images'. Each such image has a header containing its name