ASoC: mid-x86 - remove the flag in makefile

previous commit e62255f2 introduced DDEBUG flag in Makefile
This causes all debug statemenets to be ON.

This patch removes this flag
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Harsha Priya <priya.harsha@intel.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/mid-x86/Makefile

-EXTRA_CFLAGS += -DDEBUG
-
 snd-soc-sst-platform-objs := sst_platform.o
 snd-soc-mfld-machine-objs := mfld_machine.o