iommu:msm: fix compilation error.

As part of Rob Clarks cleanup one of the flags have been renamed in
header which introduced a compilation failure.

drivers/iommu/msm_iommu.c: In function ‘msm_iommu_map’:
drivers/iommu/msm_iommu.c:426:7: error: ‘FL_AP_READ’ undeclared (first use in this function)
drivers/iommu/msm_iommu.c:426:7: note: each undeclared identifier is reported only once for each function it appears in
drivers/iommu/msm_iommu.c:426:20: error: ‘FL_AP_WRITE’ undeclared (first use in this function)
make[3]: *** [drivers/iommu/msm_iommu.o] Error 1
make[2]: *** [drivers/iommu] Error 2
make[1]: *** [drivers] Error 2

iThis patch fixes the error by using the new flags in the driver.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>