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: Id18d0f6177c16c7c99f91a75dd126c138352755c
Signed-off-by: Bhuvan Varshney <bvarshne@codeaurora.org>