NFC: Implement multiple NFC clock source and patch version

NFC driver to support multiple clock sources and to support patch
version ioctl to be used by the user mode driver.

Change-Id: Idd10fc1284ae1335a3a59179ad6e3e265c952d08
Acked-by: Umesh Jagga <ujagga@qti.qualcomm.com>
Signed-off-by: Bansidhar Gopalachari <bansid@codeaurora.org>