qcacld-3.0: Move sta_info from array based to hash based

Currently in hdd_adapter, the variable sta_info is an array of
hdd_station_info structured indexed by the sta_id. As sta_id is no
longer used this array based implementation becomes unnecessary.

Move the sta_info implementation to a hash table implementation.

Change-Id: I7d6fe04b7e0ab22615d431de9a10a4ad38ed65ba
CRs-Fixed: 2514280
diff --git a/Kbuild b/Kbuild
index 8fa2d1e..cbff722 100644
--- a/Kbuild
+++ b/Kbuild
@@ -77,6 +77,7 @@
 		$(HDD_SRC_DIR)/wlan_hdd_regulatory.o \
 		$(HDD_SRC_DIR)/wlan_hdd_scan.o \
 		$(HDD_SRC_DIR)/wlan_hdd_softap_tx_rx.o \
+		$(HDD_SRC_DIR)/wlan_hdd_sta_info.o \
 		$(HDD_SRC_DIR)/wlan_hdd_stats.o \
 		$(HDD_SRC_DIR)/wlan_hdd_trace.o \
 		$(HDD_SRC_DIR)/wlan_hdd_tx_rx.o \