msm: bam_dmux: optimize UL inactivity timeout

Increase UL_TIMEOUT_DELAY to 300 ms to avoid most of powerdown attempts while
in polling mode.

Signed-off-by: Alexander Filonenko <vtp684@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/548732
Tested-by: Jira Key <jirakey@motorola.com>
Reviewed-by: Check Patch <CHEKPACH@motorola.com>
Reviewed-by: Klocwork kwcheck <klocwork-kwcheck@sourceforge.mot.com>
Reviewed-by: Igor Kovalenko <cik009@motorola.com>
SLT-Approved: Christopher Fries <c.fries@motorola.com>
Submit-Approved: Jira Key <jirakey@motorola.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>