Integrate meta-seco-rk/ap/c31-things

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-rk/-/commit/fbfbf5a18919f17131b23cce7b040fd23468d673

[ROCKCHIP] disable rfkill for all rk boards

Disable rfkill for all Rockchip borads

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Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-rk/-/commit/6a0dee4c430c7d71f388c866f89004db2e2b3c9b

[C31] use branch next for both u-boot and fw-sysdata

Use branch seco_2017.09_next to build both u-boot-seco-rk and u-boot-seco-rk-fw-sysdata