[U-Boot] [PATCH] configs: Rename roc-rk3399-pc -> roc-pc-rk3399 defconfig

[djw at archiso.i-did-not-set--mail-host-address--so-tickle-me]

The mainline uses 'rk3399-*', so there're rk3399-firefly.dts,
rk3399-roc-pc.dts, rk3399-khadas-edge.dts, etc. Shall we follow the kernel
convention, or adding another roc-pc-rk3399 to the matrix?

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Best Regards,
Levin Du