NFC: Implement disable and clock enable using ioctl

nfcc will be off by default when power on by asserting disable
high and will be switched on when nfc user mode driver will be
on using power ioctl.

Change-Id: Ifcfc031a1fee226bbe8d3966f753ceeaacaca0f4
Acked-by: Umesh Jagga <ujagga@qti.qualcomm.com>
Signed-off-by: Houston Hoffman <hhoffman@codeaurora.org>