GCC4.6: Squash warnings in 4xx_enet.c

4xx_enet.c: In function 'ppc_4xx_eth_init':
4xx_enet.c:1352: warning: format '%08x' expects type 'unsigned int', but
argument 2 has type 'volatile struct mal_desc_t *'
4xx_enet.c:1352: warning: format '%08x' expects type 'unsigned int', but
argument 3 has type 'volatile struct mal_desc_t *'
4xx_enet.c:1365: warning: format '%08lx' expects type 'long unsigned int', but
argument 3 has type 'unsigned int'
4xx_enet.c:1376: warning: format '%08lx' expects type 'long unsigned int', but
argument 3 has type 'unsigned int'

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>