net: danipc: Add generic support for fsm targets

Existing driver expects all IPC fifos to be defined in the dtsi
whether or not they are used in the target. In fsm9010 target
these fifos do not exist and the driver bails out if absent
in the dtsi.

Add support to make driver flexible to accept list of IPC fifos
based on platform specific danipc dts entry.

Change variables and strings naming convetion from krait, cpu, dsp
to generic and relevant names apps, phycpu and phydsp respectively.

Change-Id: I2a7b3f8ab11733950191aafb87c0cd575326afd3
Acked-by: Vijayapal Akula <akulav@qti.qualcomm.com>
Signed-off-by: Venkatesh Yadav Abbarapu <quicvenkat@codeaurora.org>