ARM: OMAP: Fix warnings

WARNING: drivers/char/hw_random/omap-rng.o - Section
mismatch: reference to .init.text: from .data between '$d'
(at offset 0x0) and 'omap_rng_ops'
WARNING: drivers/char/hw_random/omap-rng.o - Section
mismatch: reference to .exit.text: from .data between '$d'
(at offset 0x4) and 'omap_rng_ops'

Signed-off-by: Dirk Behme <dirk.behme_at_gmail.com>