Android: move libdrm settings to top-level Android.common.mk

Android: move libdrm settings to top-level Android.common.mk

Fix warnings like these due to HAVE_LIBDRM being inconsistently defined:

external/libdrm/include/drm/drm.h:839:30: warning: redefinition of typedef 'drm_clip_rect_t' is a C11 feature [-Wtypedef-redefinition]
typedef struct drm_clip_rect drm_clip_rect_t;

HAVE_LIBDRM needs to be set project wide to fix this. This change also
harmlessly links libdrm with everything, but simplifies the makefiles a
bit.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Emil Velikov <emil.velikov@collabora.com>