ARM: OMAP: remove sr32() from OMAP board code

Replace the custom sr32() bit manipulation function in
arch/arm/cpu/armv7/omap3/board.c and board/ti/panda/panda.c
by standard I/O accessors.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Tom Rini <trini@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>