NFC: Remove unused LDO request code

No current hardware uses this LDO pin.  We were voting this LDO allways on.
Pin configurations should use an allways on LDO.  New hardware requiring
LDO voting needs an LDO voting rework. Thus we remove the current unused
LDO code.

Change-Id: Icf2c911065b6900a3e6635678903d11e73792fb3
Signed-off-by: Houston Hoffman <hhoffman@codeaurora.org>