xen/arm: smmu-v3: address violations of MISRA C:2012 Rule 16.3

Add a break statement at the end of the switch-clauses to address
violations of MISRA C:2012 Rule 16.3 ("An unconditional `break'
statement shall terminate every switch-clause").
No funtional change.

Signed-off-by: Federico Serafini <[email protected]>
Acked-by: Julien Grall <[email protected]>
Reviewed-by: Bertrand Marquis <[email protected]

xen/drivers/passthrough/arm/smmu-v3.c

@@ -2200,6 +2200,7 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
 		fallthrough;
 	case IDR0_STALL_MODEL_STALL:
 		smmu->features |= ARM_SMMU_FEAT_STALLS;
+		break;
 	}
 
 	if (reg & IDR0_S2P)
@@ -2301,6 +2302,7 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
 		fallthrough;
 	case IDR5_OAS_48_BIT:
 		smmu->oas = 48;
+		break;
 	}
 
 	smmu->oas = min_t(unsigned long, PADDR_BITS, smmu->oas);