Merge pull request #69267 from MattyWilliams22/ec-omaps-enabled

osd: Enable support for omaps in EC pools

Reviewed-by: Radoslaw Zarzynski <rzarzyns@redhat.com>
Reviewed-by: Alex Ainscow <aainscow@uk.ibm.com>
Reviewed-by: Bill Scales <bill_scales@uk.ibm.com>