msm: Kernel module to support bus performance monitoring applications

This kernel module is used to mmap() hardware registers for the
performance monitors, counters, etc. The module can also be used to
allocate physical memory which is used by bus performance hardware to
dump performance data.

Change-Id: I5309b84405f40812205f75e0accc9f3fb0c4839c
Signed-off-by: Kenneth Heitke <kheitke@codeaurora.org>
Signed-off-by: Harini Jayaraman <harinij@codeaurora.org>