qcacld-3.0: Featurize BUILD_DIAG_VERSION

Featurize BUILD_DIAG_VERSION to compile out to save memory.

Change-Id: Ib6b6c8d197556a9457e600dd5e802f7e50f6242d
CRs-Fixed: 2301487

configs/genoa.common

@@ -60,7 +60,7 @@ endif
 # Debug specific features
 CONFIG_WLAN_LOGGING_BUFFERS_DYNAMICALLY := y
 BUILD_DEBUG_VERSION := y
-BUILD_DIAG_VERSION := y
+BUILD_DIAG_VERSION := n
 
 CONFIG_REMOVE_PKT_LOG := n
 CONFIG_FEATURE_HTC_CREDIT_HISTORY := y