aspeed: cleanup u-boot-fw-utils config

Move files with identical content to the base aspeed layer.
Remove unnecessary u-boot bbappends as the u-boot binary does not
depend on fw_env.config content.

Tested: Built u-boot and fw-utils recipes, validated packages
Change-Id: Iee3d3f76b93ff5f6d59ebeb18f08ad42cb6d187b
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
9 files changed