usb: misc: diag_ipc_bridge: Patch debug statements

Remove pr_fmt declaration and add function name and new line
functionality to the debug prints instead. Add more debug logs
where necessary.

Change-Id: Iedf27473174eeae1c8032c133250a190978d38e5
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>