gpu:msm: Fix 5.0 compile

* These need to be static to avoid these errors:

drivers/built-in.o: In function `.LANCHOR1':
msm_iommu_sec.c:(.data+0x9298): undefined reference to `kgsl_iommu_sync_lock'
msm_iommu_sec.c:(.data+0x929c): undefined reference to `kgsl_iommu_sync_unlock'
Makefile:877: recipe for target '.tmp_vmlinux1' failed
make: *** [.tmp_vmlinux1] Error 1

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

drivers/gpu/msm/kgsl_iommu.c

@@ -1002,7 +1002,7 @@ static int kgsl_iommu_init_sync_lock(struct kgsl_mmu *mmu)
  *
  * Return - int - number of commands.
  */
-inline unsigned int kgsl_iommu_sync_lock(struct kgsl_mmu *mmu,
+static inline unsigned int kgsl_iommu_sync_lock(struct kgsl_mmu *mmu,
 						unsigned int *cmds)
 {
 	struct kgsl_device *device = mmu->device;
@@ -1072,7 +1072,7 @@ inline unsigned int kgsl_iommu_sync_lock(struct kgsl_mmu *mmu,
  *
  * Return - int - number of commands.
  */
-inline unsigned int kgsl_iommu_sync_unlock(struct kgsl_mmu *mmu,
+static inline unsigned int kgsl_iommu_sync_unlock(struct kgsl_mmu *mmu,
 					unsigned int *cmds)
 {
 	struct kgsl_device *device = mmu->device;