Revert meta-arm and meta-freescale update: C61 flashing failure

Revert the update including u-boot update until the cause is found

added 2 commits

• c8e9238a - Revert "default.xml: Bump meta-arm revision"
• 6ee4d76b - Revert "default.xml: Bump meta-freescale revision"

Compare with previous version

requested review from @idlethread, @agherzan, @bero, @esben, and @ektor5

approved this merge request

approved this merge request

merged

mentioned in issue #750

Most merge approved.