qup_i2c: Add runtime PM support to I2C QUP controller

Runtime PM is used to turn clocks on and off when the
controller is not in use. When the controller is used
for messaging, pm_runtime_get_sync is called before
sending the message. pm_runtime_mark_last_busy and
pm_runtime_put_autosuspend are called when message
is sent and/or response is received.

Change-Id: Icb1d6e6ad222663c9a3598da10bdc154845083a0
CRs-Fixed: 406910
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>
Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>
Signed-off-by: Manish Kumar <manishku@codeaurora.org>