radio: RTC6226: Make the rtc6226 driver compatible with QTI platform

Moved the power on functionality under set control ioctl.
Removed the blocker code for tune, seek operation.
added code for posting event to user space
as part of interrupt handling.

Change-Id: Ic4c14e4661ef1524868e99588c0e11838341ed83
Signed-off-by: himta ram <hram@codeaurora.org>