Legacy raw MIDI support for UMP streams

configname: CONFIG_SND_UMP_LEGACY_RAWMIDI

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>Legacy raw MIDI support for UMP streams
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This option enables the legacy raw MIDI support for UMP streams.
When this option is set, an additional rawmidi device for the
legacy MIDI 1.0 byte streams is created for each UMP Endpoint.
The device contains 16 substreams corresponding to UMP groups.