Follow-up from "[kirkstone] Update support for official meta-freescale compatible with kirkstone"

The following discussion from !1 (merged) should be addressed:

• @tobias.poganiuch started a discussion: (+1 comment)

  The tune-cortexa72-cortexa53.inc seems to not work with the i.MX8MM. Can we move the include to the machine itself (e.g. seco-imx8qm-c26.conf)?