qcacld-3.0: Introduce a new flag to enable the low power mode

This change enables the CONFIG_ENABLE_LOW_POWER_MODE
based on the new flag added for the talos target.
This Low power config enabled the Deep Sleep / Hibernate
feature in WLAN.

Change-Id: Ied9a52d3b225957d0c3121df50bcd43d0ce7c7fc
CRs-Fixed: 3219080

configs/default_defconfig

@@ -1542,3 +1542,7 @@ CONFIG_FEATURE_MCL_REPEATER := y
 CONFIG_BYPASS_WDS_OL_OPS := y
 CONFIG_WDS_CONV_TARGET_IF_OPS_ENABLE := y
 endif
+
+ifeq ($(CONFIG_CNSS_SM6150), y)
+CONFIG_ENABLE_LOW_POWER_MODE := y
+endif