msm_rtb: Redefine readX_no_log based on architecture

The readX_no_log macros use __iormb(), which has a different
function prototype based off of whether or not the architecture
is 32-bit or 64-bit, so define these macros accordingly.

Change-Id: Id52fd0217822371e4db9efd49c8ea35af434d71f
Signed-off-by: Melody Olvera <molvera@codeaurora.org>