i2c-msm-v2: factor out logging and debugfs

Factor out the logging and debugfs from the i2c driver
to a separate source file to improve modularity.

Change-Id: I813c0360358ee185d42d675e156c62ffbaf00e8c
Signed-off-by: Ankit Gupta <ankgupta@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>