MLK-11407-3: regulator: anatop: force vddpu to use same voltage level as vddsoc

MLK-11407-3: regulator: anatop: force vddpu to use same voltage level as vddsoc

This patch cherry-pick from below:
"ENGR00317981: regulator: anatop: force vddpu to use same voltage level as vddsoc"

The anatop on i.MX6 requires that vddpu use the same voltage level as
vddsoc.  It's a quick hacking to force the check whenever vddpu is
about to be enabled.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Robin Gong <b38343@freescale.com>
(cherry picked from commit ab0c52e019cacc89aec3dbb104360b4715d49796)

Conflicts:
	drivers/regulator/anatop-regulator.c