net: danipc: Receive interrupts specific to APPS IPC FIFO alone

Currently APPS processor receives interrupts from all
IPC FIFOS (including FIFOS not relevant to APPS).

Change KRAIT_IPC_INTR_ENAB to receive only APPS IPC FIFO
interrupts. This will reduce APPS CPU load by avoiding
non-relevant interupts.

Change-Id: Ic1556367b9bde63f8ff92aae41ed67b7da4f152a
Acked-by: Vijayapal Akula <akulav@qti.qualcomm.com>
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>