Incorrect CFLAGS- usage failed to add -DDYNAMIC_DEBUG_MODULE when needed,
which broke builds with:

CONFIG_DRM_USE_DYNAMIC_DEBUG=Y
CONFIG_DYNAMIC_DEBUG_CORE=Y
CONFIG_DYNAMIC_DEBUG=N

Also add subdir-ccflags so that all drivers pick up the addition.

Fixes: 84ec67288c10 ("drm_print: wrap drm_*_dbg in dyndbg descriptor factory 
macro")
Signed-off-by: Jim Cromie <jim.cro...@gmail.com>
---
 drivers/gpu/drm/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 7a09a89b493b..013cde886326 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -3,7 +3,8 @@
 # Makefile for the drm device driver.  This driver provides support for the
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
-CFLAGS-$(CONFIG_DRM_USE_DYNAMIC_DEBUG) += -DDYNAMIC_DEBUG_MODULE
+ccflags-$(CONFIG_DRM_USE_DYNAMIC_DEBUG)                += 
-DDYNAMIC_DEBUG_MODULE
+subdir-ccflags-$(CONFIG_DRM_USE_DYNAMIC_DEBUG) += -DDYNAMIC_DEBUG_MODULE
 
 drm-y := \
        drm_aperture.o \
-- 
2.41.0

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