Remove zfs_sync() panicking kernel check

This check provides no real additional protection and unnecessarily
introduces a dependency on the "oops_in_progress" kernel symbol.
Remove the check, it there are special circumstances on other
platforms which make this a requirement it can be reintroduced
for all relevant call paths in a more portable comprehensive manor.

Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #8297 

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