Add a sysdev for DBDMA PM.
Signed-off-by: NManuel Lauss <manuel.lauss@gmail.com>
To: Linux-MIPS <linux-mips@linux-mips.org>
Patchwork: http://patchwork.linux-mips.org/patch/1119/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>