Bosch Sensortec BMP18x device driver V1.1

Change-Id: I971025377c938c7f40a1c8ac38c3f4479fcdde32
Signed-off-by: Hongji Zhou <Hongji.Zhou@cn.bosch.com>
Signed-off-by: Wentao Xu <wentaox@codeaurora.org>
Git-commit: 990b8869b72d7c5f951b308f4b6ba2b0c043452b
Git-repo: https://github.com/Bosch-Sensortec/bst-sensor-linux-drv


[lix@codeaurora.org: Resolve trivial compiling issues.]
Signed-off-by: Xiaocheng Li <lix@codeaurora.org>