msm: rpm: Add sysfs nodes to read driver and fw versions

Add RPM platform driver to export RPM kernel driver and firmware
version using

	cat /sys/devices/platform/msm_rpm/driver_version
	cat /sys/devices/platform/msm_rpm/fw_version

Signed-off-by: Praveen Chidambaram <pchidamb@codeaurora.org>
3 files changed