dev-arm: Fix SMMUv3 walkMasks in page table ops
dev-arm: Fix SMMUv3 walkMasks in page table ops

The masks did not include the high bits above the active addressing
bits.
This could cause overlapping issues when using high addresses.
(Translated with TTBR1)

Change-Id: Ib705558aac456c1b3f069e1bd3ccdd9229a1c1d2
Reviewed-by: Nikos Nikoleris <b6a1b3cd9d36c44e9eeb16bc870df3cb2a0cf469@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/23764
Maintainer: Giacomo Travaglini <8eef13a4f970e2e9372c8d26ad0737b760f99c02@arm.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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