msm: move scm-boot header out of mach-msm folder

Move scm-boot header from mach-msm to machine independent
location in kernel. Change the source files which are
referring to these headers and point them to a new
location.

Change-Id: I27c4b9a46f92e50f3faad89c4a7f4e06e21a1da4
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>