Dmitry Chagin af29f39958 umtx: Split umtx.h on two counterparts.
To prevent umtx.h polluting by future changes split it on two headers:
umtx.h - ABI header for userspace;
umtxvar.h - the kernel staff.

While here fix umtx_key_match style.

Reviewed by:		kib
Differential Revision:	https://reviews.freebsd.org/D31248
MFC after:		2 weeks
2021-07-29 12:41:29 +03:00
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