cmrt: Delete the hardcoded search patch for drm header
cmrt: Delete the hardcoded search patch for drm header

In fact it is already defined in ${DRM_CFLAGS}, which is used in
AM_CPPFLAGS. So remove it.

Change-Id: I4d38209f4ec5ed661f1efdc1e76b868abea959b4
Signed-off-by: Zhao Yakui <21bae65ecea50a19bd9d0fef489914760189fd5b@intel.com>

BtbN/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,seanvk/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,BtbN/intel-hybrid-driver,01org/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,seanvk/intel-hybrid-driver,seanvk/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,BtbN/intel-hybrid-driver,01org/intel-hybrid-driver,gbeauchesne/libva-intel-hybrid-driver,01org/intel-hybrid-driver,01org/intel-hybrid-driver,01org/intel-hybrid-driver,BtbN/intel-hybrid-driver,BtbN/intel-hybrid-driver,seanvk/intel-hybrid-driver,seanvk/intel-hybrid-driver