armv8: ls2088ardb: Add TFABOOT support

TFABOOT support includes:
  - ls2088ardb_tfa_defconfig to be loaded by trusted firmware
  - environment address and size changes for TFABOOT
  - define BOOTCOMMAND for TFABOOT
  - remove EL3 specific erratas for TFABOOT

Signed-off-by: Pankit Garg <pankit.garg@nxp.com>
Signed-off-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>