i2c: i2c-qcom-geni: Add SSR support for SSC QUPs

This feature is being implemented/required for SSC I2C SEs which will
operate only in FIFO mode. Common driver gets initial notification about
SSR and respective bus client driver gets called accordingly for SSR down
and up sequence. I2C driver ensures to take care of ongoing transfer with
clean suspend. This feature gets controlled with dtsi flag entry per i2c
node.

Change-Id: Id711a7300e640f34a4f6ea88ed33ca9226e3e575
Signed-off-by: Ashish Kori <akori@codeaurora.org>