usb: bam: Increase polling time to query IPA BAM pipe status

USB BAM driver polls IPA BAM pipe status for emptiness having retry
timeout using usleep_range(1000, 2000) in USB cable disconnect or USB
bus suspend scenarios. In some cases of USB cable disconnect, it has
been observed that USB BAM driver finds IPA BAM pipe non-empty and
crashing device explicitly, and there is possibility IPA peripheral is
about to consume pending provided descriptors. Hence increase polling
time by replacing number of retry count from 10 to 50 which increases
max timeout as 100ms from existing 20ms.

Change-Id: I673c2532d901cc3d3f7ede06da5c0338de10b81f
Signed-off-by: Mayank Rana <mrana@codeaurora.org>