hw/arm/smmuv3: Fix decoding of ID register range

The SMMUv3 ID registers cover an area 0x30 bytes in size
(12 registers, 4 bytes each). We were incorrectly decoding
only the first 0x20 bytes.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NEric Auger <eric.auger@redhat.com>
Message-id: 20190524124829.2589-1-peter.maydell@linaro.org

hw/arm/smmuv3.c

@@ -1232,7 +1232,7 @@ static MemTxResult smmu_readl(SMMUv3State *s, hwaddr offset,
                               uint64_t *data, MemTxAttrs attrs)
 {
     switch (offset) {
-    case A_IDREGS ... A_IDREGS + 0x1f:
+    case A_IDREGS ... A_IDREGS + 0x2f:
         *data = smmuv3_idreg(offset - A_IDREGS);
         return MEMTX_OK;
     case A_IDR0 ... A_IDR5: