iommu/arm-smmu: set MAX_MASTER_STREAMIDS to MAX_PHANDLE_ARGS

The DT parsing code that determines stream IDs uses
of_parse_phandle_with_args and thus MAX_MASTER_STREAMIDS
is always bound by MAX_PHANDLE_ARGS.

Change-Id: I21efeb5c1e57885aa5eeaedf7bceeabcfb5f6a02
Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Git-commit: 636e97b0fb0a063dc89773b13064647f5da632cb
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


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