arm-autonomy/n1sdp: add kernel modules to mount FAT filesystem

This patch adds kernel modules necessary for n1sdp to mount the FAT filesystem
codepage 437 and NLS ISO 8859-1.

Issue-Id: SCM-2682
Signed-off-by: Hugo L'Hostis <hugo.lhostis@arm.com>
Change-Id: I2d4fede311544917050326564b2b0a7d0123cb21
Signed-off-by: Jon Mason <jon.mason@arm.com>