The only remaining user of the custom bit manipulation function sr32()
is arch/arm/cpu/armv7/omap3/clock.c, so  make it a static function in
that file to prepare complete removal.
Signed-off-by: NWolfgang Denk <wd@denx.de>
Cc: Tom Rini <trini@ti.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>