Revert "msm: bam_dmux: optimize UL inactivity timeout"

This reverts commit 309e3f16e485630bcc2b6db2aefc033ad12d83e1.
Revert "Delay UL powerdown if BAM is in polling mode"

This reverts commit bac21ed2e09211168407fe7fb2d3a45b74f7b70a.
Revert "msm: bam_dmux: UL inactivity timeout is too high"

This reverts commit 4716fe82f1d4afdcf3ac95e9baa0cbd9576c5894.