ARM: dts: msm: Add adsp-loader support for APQ8084

adsp-loader is required by audio to load the dsp image and
continue with audio initialization. Add support for adsp-loader
in device tree for APQ8084

Change-Id: I5e460933a3d6297408fcddbd132392cabef02369
Signed-off-by: Banajit Goswami <bgoswami@codeaurora.org>