GCC4.6: Fix warnings in pxa_mmc.c

GCC4.6: Fix warnings in pxa_mmc.c

pxa_mmc.c: In function 'mmc_cmd':
pxa_mmc.c:77:2: warning: format '%08x' expects type 'unsigned int', but argument
2 has type 'ulong'
pxa_mmc.c: In function 'mmc_block_read':
pxa_mmc.c:110:2: warning: format '%d' expects type 'int', but argument 4 has
type 'ulong'
pxa_mmc.c: In function 'pxa_mmc_write':
pxa_mmc.c:327:2: warning: format '%lx' expects type 'long unsigned int', but
argument 2 has type 'uchar *'
pxa_mmc.c:349:2: warning: format '%lx' expects type 'long unsigned int', but
argument 2 has type 'uchar *'
pxa_mmc.c:354:3: warning: format '%lx' expects type 'long unsigned int', but
argument 2 has type 'uchar *'
pxa_mmc.c:362:2: warning: format '%lx' expects type 'long unsigned int', but
argument 2 has type 'uchar *'
pxa_mmc.c:367:3: warning: format '%lx' expects type 'long unsigned int', but
argument 2 has type 'uchar *'

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Mike Frysinger <vapier@gentoo.org>