usb: misc: ks_bridge: Enable enumeration on second xHCI port

There might be 2 USB ports on some platform and the second USB
port's xhci plat device comes up as xhci-hcd.1.auto. Enable
ks_bridge dev enumeration on this port by adding the str_to_busid
check.

Change-Id: I3cd399c247774d890614d458a63022909199dd0c
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>