IGEPv2: Added WIFI support

Enabled VMMC2 LDO voltage regulator on TWL4030.
Added GPIO's (power down and reset) for WIFI chip.

Signed-off-by: Anders Hedlund <anders.j.hedlund@gmail.com>
Signed-off-by: Jonas Zetterberg <jozz@jozz.se>
Signed-off-by: Tony Lindgren <tony@atomide.com>