Makefile: drop -D__CHECK_ENDIAN__ from cflags

That's the default now, no need for makefiles to set it.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>

net/mac802154/Makefile

@@ -3,5 +3,3 @@ mac802154-objs		:= main.o rx.o tx.o mac_cmd.o mib.o \
 			   iface.o llsec.o util.o cfg.o trace.o
 
 CFLAGS_trace.o := -I$(src)
-
-ccflags-y += -D__CHECK_ENDIAN__