i2c-msm-v2: correct pm state in system suspend

I2C driver rejects all the clients transfer requests
while system is suspending. However the driver services
requests when in runtime suspend. Current system suspend
implementation is setting internal state to runtime
suspend but state should be system suspend.

Change-Id: I9285a4260ed2becc449bb7854f3ad69204250f22
Signed-off-by: Ankit Gupta <ankgupta@codeaurora.org>