Release v1.2.7.2

Core
 - Release v1.2.7.2
Mixer API
 - mixer: add documentation about postcondition of removal event processing
PCM API
 - pcm: share plugin: handle -EINTR
 - pcm: share plugin: return error if socket read or write call fails
RawMidi API
 - rawmidi: fix the params_mode check condition in snd_rawmidi_tread()
Use Case Manager API
 - ucm: fix st_mode check for symbolic links
Kernel Headers
 - include/sound/type_compat.h: fix include guard

Signed-off-by: Jaroslav Kysela <perex@perex.cz>