msm: move SPM and AVS headers to machine independent directory

As part of power drivers code reorganising, move SPM and AVS
header files into machine independent directory. To avoid
compilation errors change the header file paths.

Change-Id: I5fafb1a08b309e30fb2f0241dd557a83419a06a0
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>