qcacld-3.0: Enable SMMU S1 unmap config for SDXPRAIRIE

Enable SMMU S1 unmap config flag to do SMMU unmap of
IPA TX/RX doorbell registers as part of IPA cleanup.

Change-Id: I056a82592928aa1dde0e9c1ed43c1135424750a8
CRs-Fixed: 2777804

configs/default_defconfig

@@ -806,6 +806,7 @@ endif
 ifeq ($(CONFIG_ARCH_SDXPRAIRIE), y)
 ifeq ($(CONFIG_IPA_OFFLOAD), y)
 CONFIG_ENABLE_SMMU_S1_TRANSLATION := y
+CONFIG_SMMU_S1_UNMAP := y
 endif
 endif