arm/mx2/devices: no need for IMX_NEEDS_DEPRECATED_SYMBOLS any more

The previous commits cleaned up arch/arm/mach-mx2/devices.c such that it
doesn't rely on deprecated symbols any more.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

arch/arm/mach-mx2/Makefile

@@ -6,7 +6,6 @@
 
 obj-y	:=  generic.o devices.o serial.o
 CFLAGS_generic.o = -DIMX_NEEDS_DEPRECATED_SYMBOLS
-CFLAGS_devices.o = -DIMX_NEEDS_DEPRECATED_SYMBOLS
 
 obj-$(CONFIG_MACH_MX21) += clock_imx21.o