msm: camera: Bug fixes for new architecture

Fix bugs so user side can invoke a kernel side eeprom read
through MSM_CAM_IOCTL_OEM

1. Handel MSM_CAM_IOCTL_OEM in msm_mctl
2. Fix handling of CFG_GET_EEPROM_DATA in msm_sensor_bayer
3. Add a function table entry for eeprom read function in sensor_ctrl_t.

Change-Id: I1f503f7054a17e34ceb4596910b494b2151470ed
Signed-off-by: Jack Wang <jackwang@codeaurora.org>