UPSTREAM?: mwifiex: shorten per channel scan time

UPSTREAM?: mwifiex: shorten per channel scan time

Currently the scan time per channel for active scanning is set to
200ms. It takes quite a while to finsh scanning on all channels,
especially with a dual band configuration.

Change the per channel scan time settings to the following values:

passive scan: 110ms
active scan: 30ms
specific scan: 30ms

Above settings have been tested on x86 and arm platforms.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
BUG=chrome-os-partner:8707
TEST=ping+scan test

Change-Id: Ib85bf163378268b9453cb329ccae603bfb70eeaa
Reviewed-on: https://gerrit-int.chromium.org/19350
Commit-Ready: Sam Leffler <sleffler@google.com>
Reviewed-by: Sam Leffler <sleffler@google.com>
Tested-by: Sam Leffler <sleffler@google.com>