libmediactl: split media_get_devname_sysfs from media_enum_entities
libmediactl: split media_get_devname_sysfs from media_enum_entities

Signed-off-by: Andy Shevchenko <74f0c009df510614346aa771cd21959b78cdb413@linux.intel.com>

RobertCNelson/media-ctl,suapapa/media-ctl,baileyji/media-ctl,suapapa/media-ctl