Staging: silicom: capitalize labels in the bp_media_type enum

Capitalize the names of the media types in enum bp_media_type in
bpctl_mod.c, as is the preffered style.

Signed-off-by: Chad Williamson <chad@dahc.us>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>