msm: iomap: cleanup unified iomap

Several entries in the unified iomap table were not ordered by virtual
addess, thereby making it difficult to determine where gaps in the table
existed for new entries.  Put the out of order entires into the correct
order.

Also, remove MSM_MDC_BASE as it is not used and its virtual address
overlays the MSM_SHARED_RAM_BASE which could cause future memory
corruption.

Change-Id: I094d5517f3837b31f382435a55434536567118a1
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>