msm: soc: Rename soc/msm to soc/qcom

We are using 'qcom' now for DT, file and directory names so rename
drivers/soc/msm to drivers/soc/qcom and fixup related header files
and path issues.

Change-Id: Ibd32a507afaec1920b0289df107231eb7d6ef5e1
Signed-off-by: Kumar Gala <galak@codeaurora.org>