Remove comma after $(warning)

Having the comma there makes the warning not print,
and makes the Starlark autoconverter fail to convert
the warning.

Fixes: 223228037
Test: Manually
Change-Id: I7652e9a35c840ca493a064aec886ff3587ee52e4
diff --git a/device-common.mk b/device-common.mk
index ec3d793..33d28c1 100644
--- a/device-common.mk
+++ b/device-common.mk
@@ -38,7 +38,7 @@
   $(warning    $(VND_PKG_URL) )
   $(warning And extract in the ANDROID_TOP_DIR)
 endif
-$(warning, EXPECTED_LINARO_VENDOR_VERSION=$(EXPECTED_LINARO_VENDOR_VERSION))
+$(warning EXPECTED_LINARO_VENDOR_VERSION=$(EXPECTED_LINARO_VENDOR_VERSION))
 
 ifneq (,$(filter $(TARGET_PRODUCT),hikey960_tv hikey_tv))
 # Setup TV Build