On x86_64 we need CONFIG_PHYS_ADDR_T_64BIT to make the resource sizes
64bit. The kernel has this as a Kconfig variable, but on barebox sandbox
will build with whatever compiler we find, so we can't put it into Kconfig.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Move platform independent header files to arch/sandbox/include/asm, leaving
those in asm/arch*.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>