common: fdt_support: print hexadecimal numbers in debug

We usually deal with hexadecimal addresses and sizes in
device-tree. Its much easier if debug logs print hexadecimal
values too.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>