msm : ais : diagnostic feature

provide the functions:
1. record the all camera related clocks' status
2. provide the get clock status interfaces
3. provide the read registers interfaces
4. provide read the regulators' status
5. provide set/get the specified gpio
6. get the ISP buffer states

Change-Id: I5ddb6ac5488aa46914a5fc6b642d8330e72d9b70
Signed-off-by: Chunhuan Zhan <zhanc@codeaurora.org>