ENGR00120456 mx51: set VIOHI always on

Set regulator VIOHI to be always on for several
soc power domains are supplied by VIOHI

Signed-off-by: Zhou Jingyu <Jingyu.Zhou@freescale.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>