Sync regcache when entering STANDBY from OFF.  ON isn't entered with
OFF as the current state, so the registers were not being re-synced
after suspend/resume.

The 98088 and 98095 already call regcache_sync from STANDBY.
Signed-off-by: NDylan Reid <dgreid@chromium.org>
Signed-off-by: NMark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org