FreeBSD: Clean up the use of ioflags

- Prefer O_* flags over F* flags that mostly mirror O_* flags anyway,
  but O_* flags seem to be preferred.
- Simplify the code as all the F*SYNC flags were defined as FFSYNC flag.
- Don't define FRSYNC flag, so we don't generate unnecessary ZIL commits.
- Remove EXCL define, FreeBSD ignores the excl argument for zfs_create()
  anyway.

Reviewed-by: Allan Jude <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Pawel Jakub Dawidek <[email protected]>
Closes #13400 

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