MLK-18456-4 configs: mx6sx_arm2: Add defconfigs for 17x17 ARM2

To support various boot devices on iMX6SX 17x17 ARM2, add the
relevant defconfigs.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit e5c717176588449def0efcf2540d37a3d9d65094)
(cherry picked from commit 5c9a35a9507e1df7b571ff4463555032ba823284)
7 files changed