power: smb5-lib: Report HS mode for uUSB connector

Currently, for extcon notification, smb5 driver always reports SS
mode irrespective of the connector type. However, uUSB connector
supports only HS mode. Hence, change the extcon notification flow
to report HS mode for uUSB connector.

Change-Id: I870941b1e63fc8043a8e8f6cf80174996a2b65b8
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>