greybus: use decimal notation for interfaces, bundles and cports

Fix up the last few places where hexadecimal rather than decimal
notation was used for interface, bundle and cport ids.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>