Mark BOARD_HAL_STATIC_LIBRARIES as obsolete.

No device in our tree use this obsolete thing now.
OEM devices with libhealthd should define health HAL
2.1 instead.

Test: builds
Fixes: 127677771
Change-Id: I1861452a3f7fc97ee20615c8f9f25422f9f507e2
diff --git a/core/config.mk b/core/config.mk
index 9ab3fff..4cc78b8 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -120,6 +120,8 @@
 )
 $(KATI_obsolete_var PRODUCT_IOT)
 $(KATI_obsolete_var MD5SUM)
+$(KATI_obsolete_var BOARD_HAL_STATIC_LIBRARIES, See $(CHANGES_URL)#BOARD_HAL_STATIC_LIBRARIES)
+$(KATI_obsolete_var LOCAL_HAL_STATIC_LIBRARIES, See $(CHANGES_URL)#BOARD_HAL_STATIC_LIBRARIES)
 
 # Used to force goals to build.  Only use for conditionally defined goals.
 .PHONY: FORCE