msm: sensor: Fix to validate the settings size in flash

The size of the settings, copied from userspace, is directly checked
in msm_cci_data_queue with CCI_I2C_MAX_WRITE. This might cause
out of bound access in function msm_cci_data_queue as the max size is
MAX_I2C_REG_SET. Hence adding check on the size in flash driver itself.

Change-Id: Ifac358be9f4b4ff60d14c20e02886c2d044e7f52
Signed-off-by: Samyukta Mogily <smogily@codeaurora.org>