mhi: controller: qcom: added support to dynamically switch L1 configuration

Add support for dynamically enable and disable L1 for low
latency applications.

CRs-Fixed: 2306423
Change-Id: Ib7d822a94235a1590fc148fb2123bcd319e80377
Acked-by: Bhaumik Vasav Bhatt <bbhatt@qti.qualcomm.com>
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>