Add a 'dtbs' Makefile target that just builds the device-tree binaries
enabled by the configuration.
Signed-off-by: Andrew Bresticker
Cc: Rob Herring
Cc: Pawel Moll
Cc: Mark Rutland
Cc: Ian Campbell
Cc: Kumar Gala
Cc: James Hogan
Cc: Paul Burton
Cc: David Daney
Cc: John Crispin
Cc: Jayachandran C
Cc: Qais Yousef
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: devicetree@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7557/
Signed-off-by: Ralf Baechle