Move KTR_CXGBE from t4_tom.h to adapter.h so that the base if_cxgbe
code can use it too.

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@275733 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f