iommu/arm-smmu: Refine check for proper size of mapped region

There is already a check to print a warning if the size of SMMU
address space (calculated from SMMU register values) is greater than
the size of the mapped memory region (e.g. passed via DT to the
driver).

Adapt this check to print also a warning in case the mapped region is
larger than the SMMU address space.

Such a mismatch could be intentional (to fix wrong register values).
If its not intentional (e.g. due to wrong DT information) this will
very likely cause a malfunction of the driver as SMMU_CB_BASE is
derived from the size of the mapped region. The warning helps to
identify the root cause in this case.

Change-Id: Ife51929a44dca8fd8a33550fbc38faa8c40f77a2
Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: c55af7f719cbb0f0b28f42b3f98f662278f063c2
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>