In preparation to support multi-platform kernels, move all the dtb targets
out of the mach Makefile.boot and into the arch/arm/boot/dts/Makefile
which is closer to the sources.
DTBs are only built when CONFIG_OF is enabled and now use top level
CONFIG_ARCH_xxx instead of chip or board specific config options.
Signed-off-by: Rob Herring
Cc: Russell King
Cc: Andrew Victor
Cc: Nicolas Ferre
Cc: Jean-Christophe Plagniol-Villard
Cc: Kukjin Kim
Cc: Sascha Hauer
Cc: Jason Cooper
Cc: Andrew Lunn
Cc: Gregory Clement
Acked-by: Shawn Guo
Cc: Viresh Kumar
Cc: Shiraz Hashim
Cc: Rajeev Kumar
Cc: Stephen Warren
Cc: Srinidhi Kasagar
Cc: Linus Walleij