OMAP3: Use sdelay from arch/arm/cpu/armv7/syslib.c instead of cloning that.

There is no need to have such a function twice.

Signed-off-by: Alexander Holler <holler@ahsoftware.de>
Acked-by: Dirk Behme <dirk.behme@googlemail.com>
Signed-off-by: Anatolij Gustschin <agust@denx.de>