fix sparse, checkpatch warnings in OMAP2/3 SCM code

Fix sparse warnings with the OMAP2 SCM code. Involves tagging
appropriate pointer<->integer type conversions with __force.  Also fix
a checkpatch warning re: conversion of asm/ includes to linux/.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>