icnss: return recovery success to wlan driver

During firmware rejuvenation the platform driver
got the pd_down indication at the same time due to
timeout in getting the ACK for the PDEV_SUSPEND command
host driver issues self recovery. Since the PD_RESTART bit
is set from the rejuvenation, platform driver rejected
the recovery request resulting in the driver bug_on.
Hence, return recovery success to wlan driver when recovery
is already in progress.

Change-Id: I2fb63970a5952c8a50c7eb7f4ab0ca9fcb5657b0
Signed-off-by: Sandeep Singh <sandsing@codeaurora.org>