iommu/msm: Make msm_iommu_lock static

Fix the following sparse warning:

drivers/iommu/msm_iommu.c:37:1: warning: symbol 'msm_iommu_lock' was not declared.

The msm_iommu_lock has only call site within msm_iommu.c
It should be static

Fixes: 0720d1f ("msm: Add MSM IOMMU support")
Reported-by: Hulk Robot <[email protected]>
Signed-off-by: Samuel Zou <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Joerg Roedel <[email protected]>

Author: SamuelZOU

drivers/iommu/msm_iommu.c

@@ -34,7 +34,7 @@ __asm__ __volatile__ (							\
 /* bitmap of the page sizes currently supported */
 #define MSM_IOMMU_PGSIZES	(SZ_4K | SZ_64K | SZ_1M | SZ_16M)
 
-DEFINE_SPINLOCK(msm_iommu_lock);
+static DEFINE_SPINLOCK(msm_iommu_lock);
 static LIST_HEAD(qcom_iommu_devices);
 static struct iommu_ops msm_iommu_ops;