Change lmb to use phys_size_t/phys_addr_t

This updates the lmb code to use phys_size_t
and phys_addr_t instead of unsigned long.  Other code
which interacts with this code, like getenv_bootm_size()
is also updated.

Booted on MPC8641HPCN, build-tested ppc, arm, mips.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>

include/image.h

@@ -379,7 +379,7 @@ int image_check_dcrc (image_header_t *hdr);
 #ifndef USE_HOSTCC
 int getenv_yesno (char *var);
 ulong getenv_bootm_low(void);
-ulong getenv_bootm_size(void);
+phys_size_t getenv_bootm_size(void);
 void memmove_wd (void *to, void *from, size_t len, ulong chunksz);
 #endif