NFC: Keep VEN gpio always high from boot

VEN will be toggled from NFC driver only once during boot
and it will remain high on successful driver probe exit,
after that MW shouldn't modify it's state
as eSE is also powered using VEN gpio in SN100 NFC HW.

VEN toggle will reset eSE power and cause failure if
any communication is in progress.

Change-Id: Ieee607826f89283b25de5cd2b94a9b0c14db5363
Signed-off-by: Gaurav Singhal <gsinghal@codeaurora.org>
Signed-off-by: Niranjan Reddy Dumbala <dnreddy@codeaurora.org>