wil6210: drop -Werror compiler flag

In production code, don't use -Werror,
as it causes random compilation failures due to compiler version and options used.

With every new version of gcc, it becomes stricter and report more warnings.
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/wil6210/Makefile

@@ -11,9 +11,6 @@ wil6210-y += txrx.o
 wil6210-y += debug.o
 wil6210-$(CONFIG_WIL6210_TRACING) += trace.o
 
-ifeq (, $(findstring -W,$(EXTRA_CFLAGS)))
-	subdir-ccflags-y += -Werror
-endif
 # for tracing framework to find trace.h
 CFLAGS_trace.o := -I$(src)