greybus: endo: Use a real endo id

0x0555 isn't a valid endo id, use a real one.

0x4755 should be the Endo id for the (medium) Spiral 2 prototype. Lets
use that.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>