dm: sparc: common: Fixup cmd_bdinfo warnings

cmd_bdinfo.c: In function ‘do_bdinfo’:
cmd_bdinfo.c:220:9: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘int’ [-Wformat]
cmd_bdinfo.c:222:9: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘int’ [-Wformat]
cmd_bdinfo.c:224:9: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘int’ [-Wformat]
cmd_bdinfo.c:226:9: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘int’ [-Wformat]
cmd_bdinfo.c:228:9: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘int’ [-Wformat]

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: u-boot-dm@lists.denx.de