iommu: arm-smmu-impl: Add a space before open parenthesis

Fix the checkpatch warning for space required before the open
parenthesis.
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/0b4c3718a87992f11340a1cdd99fd746c647e485.1606287059.git.saiprakash.ranjan@codeaurora.orgSigned-off-by: Will Deacon <will@kernel.org>

drivers/iommu/arm/arm-smmu/arm-smmu-impl.c

@@ -12,7 +12,7 @@
 
 static int arm_smmu_gr0_ns(int offset)
 {
-	switch(offset) {
+	switch (offset) {
 	case ARM_SMMU_GR0_sCR0:
 	case ARM_SMMU_GR0_sACR:
 	case ARM_SMMU_GR0_sGFSR: