Ka Ho Ng 3703c18883 md: Add MD_MUSTDEALLOC support
This adds an option to detect if hole-punching is implemented by the
underlying file system.  If this flag is set, and if the underlying file
system does not support hole-punching, md(4) fails BIO_DELETE requests
with EOPNOTSUPP.

Sponsored by:	The FreeBSD Foundation
Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D31883
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