iommu/arm-smmu: Remove broken big-endian check

The bottom word of the pgd should always be written to the low half of
the TTBR, so we don't need to swap anything for big-endian.

Change-Id: I72f54abdb979624ff8f2b3589b4196844f3c8e8b
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
Git-commit: 2ae9f2fa3f770c734e713f9a0a4c40bcf2373ab6
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


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