i2c-msm-v2: improve error handling in i2c v2 driver

Change the error handling mechanism in i2c driver from
bit field to index based to handle and return the most
relevant error.

Change-Id: Ie75062543931652c08e0a6c70deb54d6140833d5
Signed-off-by: Ankit Gupta <ankgupta@codeaurora.org>