hw/arm/smmuv3: Correct SMMU_BASE_ADDR_MASK value

hw/arm/smmuv3: Correct SMMU_BASE_ADDR_MASK value

There are two issues with the current value of SMMU_BASE_ADDR_MASK:

- At the lower end, we are clearing bits [4:0]. Per the SMMUv3 spec,
  we should also be treating bit 5 as zero in the base address.
- At the upper end, we are clearing bits [63:48]. Per the SMMUv3 spec,
  only bits [63:52] must be explicitly treated as zero.

Update the SMMU_BASE_ADDR_MASK value to mask out bits [63:52] and [5:0].

ref. ARM IHI 0070C, section 6.3.23.

Signed-off-by: Simon Veith <sveith@amazon.de>
Acked-by: Eric Auger <eric.auger@redhat.com>
Tested-by: Eric Auger <eric.auger@redhat.com>
Message-id: 1576509312-13083-3-git-send-email-sveith@amazon.de
Cc: Eric Auger <eric.auger@redhat.com>
Cc: qemu-devel@nongnu.org
Cc: qemu-arm@nongnu.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>