Fix warning

arch/arm/plat-omap/mmu.c:1277: warning: initialization from
incompatible pointer type
arch/arm/plat-omap/mmu.c:1278: warning: initialization from
incompatible pointer type
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>