iommu/arm-smmu: don't touch the secure STLBIALL register

Currently we do a STLBIALL when we initialize the SMMU.  However, in
some configurations that register is not supposed to be touched and is
marked as "Secure only" in the spec.  Rip it out.

Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

drivers/iommu/arm-smmu.c

@@ -127,7 +127,6 @@
 #define ID2_PTFS_64K			(1 << 14)
 
 /* Global TLB invalidation */
-#define ARM_SMMU_GR0_STLBIALL		0x60
 #define ARM_SMMU_GR0_TLBIVMID		0x64
 #define ARM_SMMU_GR0_TLBIALLNSNH	0x68
 #define ARM_SMMU_GR0_TLBIALLH		0x6c
@@ -1414,7 +1413,6 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 	}
 
 	/* Invalidate the TLB, just in case */
-	writel_relaxed(0, gr0_base + ARM_SMMU_GR0_STLBIALL);
 	writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLH);
 	writel_relaxed(0, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);