mhi: core: remove support for bandwidth request from mhi_cb

Remove the bandwidth request entry from mhi_cb status callback
as it is no longer required.

CRs-Fixed: 2479785
Change-Id: Id5363d6162cc32ae33294bcf0a0226863495f66c
Acked-by: Bhaumik Vasav Bhatt <bbhatt@qti.qualcomm.com>
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>