imx8: Add ahab_commit command

imx8: Add ahab_commit command

The ahab_commit command allows the user to commit into the SECO fuses
that control the SRK key revocation information. This is used to Revoke
compromised SRK keys.

To use ahab_commit, the boot container must be built with an SRK
revocation bit mask that is not 0x0. For the SPSDK provided by NXP, this
means setting the 'srk_revoke_mask' option in the config file used to
sign the boot container. The 'ahab_commit 0x10' can then be used to commit
the SRK revocation information into the SECO fuses.

Signed-off-by: John Ripple <john.ripple@keysight.com>