Revert "qcacld-3.0: Add the Full Power Down feature support"

This reverts commit I293647175c151da0fd6628345f98ea65c83b1bb3.

New solution idle shutdown in suspend prepare is better.

Change-Id: I69a0e7401c811e4a9656fcc8e3dd069f4317cc35
CRs-Fixed: 3213236

Kbuild

@@ -4366,10 +4366,6 @@ endif
 
 cppflags-$(CONFIG_DP_FT_LOCK_HISTORY) += -DDP_FT_LOCK_HISTORY
 
-ifeq ($(CONFIG_WLAN_FULL_POWER_DOWN), y)
-cppflags-y += -DFEATURE_WLAN_FULL_POWER_DOWN_SUPPORT
-endif
-
 ccflags-$(CONFIG_INTRA_BSS_FWD_OFFLOAD) += -DINTRA_BSS_FWD_OFFLOAD
 ccflags-$(CONFIG_GET_DRIVER_MODE) += -DFEATURE_GET_DRIVER_MODE