Integrate meta-seco-rk/ap/rk-things

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-rk/-/commit/fe77b6d6c7c5e065f19c22f5017c455fab1e5b02

[E09] use correct branch for sysdata

The u-boot-seco-rk-fw-sysdata recipe shared the same sources as u-boot, therefore it should build from the same branch.

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Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-rk/-/commit/24fd4dbfc38bb100bb087d6b7ebd92449e5389d2

[ROCKCHIP] fix MACHINEOVERRIDES order

The MACHINEOVERRIDES variable should contain a list of overrides ordered from the most general to the most specific. This order is currently not honored.

As a result, in the following assignments (e.g.) VAR:rockchip = "rockchip-value" VAR:rk3568 = "rk3568-value" the variable VAR will always have value "rockchip-value", even on rk3568, because the overrides are evaluated from left to right and "rockchip" comes after "rk3568".

Fix that by prepending "rockchip:" to MACHINEOVERRIDES instead of appending it.