msm: iomap: Add MSMSAMARIUM support

Add the I/O map macro definitions and associated functions
needed to create the early I/O mappings on MSMSAMARIUM.

Change-Id: I839d5225e2017212fdb092f585e111e53a0f32a5
Signed-off-by: Jay Chokshi <jchokshi@codeaurora.org>