Define uintptr_t as long int to simplify printf() format strings

If uintptr_t can be either an unsigned int or an unsigned long int, it is
tricky to use it in a printf() format string. This changes it to
unsigned long int consistently. This should do the right thing on both
32-bit and 64-bit architectures.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Mike Frysinger <vapier@gentoo.org>