armv8: ls1012afrx: Add TFABOOT support

TFABOOT support includes:
  - ls1012a2g5rdb/ls1012afrdm/ls1012afrwy_tfa_defconfig to be
    loaded by trusted firmware
  - define BOOTCOMMAND for TFABOOT

Signed-off-by: Pankit Garg <pankit.garg@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
[YS: remove unnecessary braces]
Reviewed-by: York Sun <york.sun@nxp.com>
9 files changed