drm/r128: remove unneeded -Iinclude/drm compiler flag

With the include directives under include/drm/ fixed, this flag is
no longer needed.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1493009447-31524-24-git-send-email-yamada.masahiro@socionext.com

drivers/gpu/drm/r128/Makefile

@@ -2,7 +2,6 @@
 # Makefile for the drm device driver.  This driver provides support for the
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
-ccflags-y := -Iinclude/drm
 r128-y   := r128_drv.o r128_cce.o r128_state.o r128_irq.o
 
 r128-$(CONFIG_COMPAT)   += r128_ioc32.o