MLK-18129-2 imx8qm/qxp: Add secure boot environment

MLK-18129-2 imx8qm/qxp: Add secure boot environment

Add the secure boot relevant environment variables to MEK.
When CONFIG_AHAB_BOOT is enabled, we will switch to boot in this
new way:
1. Load the OS container to address 0x98000000
2. Using auth_cntr to authenticate the OS container. It will load the
   kernel and FDT to destination address.
3. Using booti to boot kernel.

Signed-off-by: Ye Li <ye.li@nxp.com>
Acked-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 545c8fe112244f20377e97921389c86eacc8551f)
(cherry picked from commit cba5acebbe6be0736f229ef719b1a1e5835e1a5f)
(cherry picked from commit 07b9850354b27dafa4cc774c59770931af2ac898)
(cherry picked from commit 149006de99c9c214232d30cc2e9795401766fe4b)