qcacld-3.0: set CONFIG_WLAN_DIAG_VERSION to y in peach config

Currently the CONFIG_WLAN_DIAG_VERSION is not being set in the
peach defconfig, causing compilation errors for peach builds.
Fix this by replacing duplicate CONFIG_WLAN_DEBUG_VERSION
with CONFIG_WLAN_DIAG_VERSION.

Change-Id: I1fc2fcfc987d63c3f038e41652ea4c43667bbe42
CRs-Fixed: 3483501

configs/peach_defconfig

@@ -470,7 +470,7 @@ endif
 CONFIG_WLAN_DEBUG_VERSION := y
 
 #Enable this flag to build driver in diag version
-CONFIG_WLAN_DEBUG_VERSION := y
+CONFIG_WLAN_DIAG_VERSION := y
 
 ifeq ($(CONFIG_SLUB_DEBUG), y)
 	PANIC_ON_BUG := y