qcacld-3.0: Enable SMMU S1 unmap config for QCA6390

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

Change-Id: I2e6e5312fb54841fde89db64071ded965c1c1bd1
CRs-Fixed: 2855099

configs/qca6390_defconfig

@@ -521,6 +521,10 @@ ifeq ($(CONFIG_IPA3), y)
 CONFIG_IPA_OFFLOAD := y
 endif
 
+ifeq ($(CONFIG_IPA_OFFLOAD), y)
+CONFIG_SMMU_S1_UNMAP := y
+endif
+
 #Flag to enable SMMU S1 support
 ifeq ($(CONFIG_ARCH_SDM845), y)
 ifeq ($(CONFIG_IPA_OFFLOAD), y)