Merge pull request #37829 from liu-chunmei/seastore-extentmap-fix

crimson/seastore: add Extentmap node type in cache.cc

Reviewed-by: Samuel Just <sjust@redhat.com>
Reviewed-by: Kefu Chai <kchai@redhat.com>

diff --cc src/crimson/os/seastore/extentmap_manager/btree/extentmap_btree_node.h
Simple merge