armv8: ls1088aqds: Add TFABOOT support

TFABOOT support includes:
 - ls1088aqds_tfa_defconfig to be loaded by trusted firmware
 - environment address and size changes for TFABOOT
 - MC address changes for TFABOOT
 - define BOOTCOMMAND for TFABOOT
 - ifc chip select changes for TFABOOT

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