ENGR00230981-2 pfuze:standby voltage increase for PFM

ENGR00230981-2 pfuze:standby voltage increase for PFM

There is 6% tolerance for PFM momde in standby so we need set 0.975V(>0.9V+%6)
for VDDSOC and VDDARM which maybe impact system resume ability.
Another two change is:
1.set  VDDARM and VDDSOC standby voltage by setting PFUZE register directly,it
is not very friendly.So use more common  "state_mem" in constrain of regulator
to set standby voltage.
2.align sabreauto code with sabresd
Signed-off-by: Robin Gong <b38343@freescale.com>