msm: pil: Differentiate header guards

The same header guard is used for peripheral-loader.h and
mach/peripheral-loader.h. This causes problems when a driver
includes both to call pil_get() and to also register the ops in
the first place. Change the msm version to fix compile errors.

Change-Id: I05a484974306f62a2086ed3ff96426ebfc482473
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>