Integrate u-boot-seco-imx/develop_c72_generic

Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/f9bbe1c9dffe7aa1041c0300180b27c5bff9127f

[C72] Enable compilation of Mini and Nano using the same board directory

We use the target to discriminate SoC specific files to compile

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/1d07c48d676aa16737be6b4fb457ac0c31cfccf2

[C72 Mini/Nano][STRAP_CFG] Add strap configuration for dual-chip RAM (x32)

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/e21258ac107c7fb6249c299f70d143bf4f37e37d

[C72 Nano] Use specific RAM configuration when necessary

We need to discriminate between single chip (x16) and double chip (x32) RAM configurations when calibrating and when changing the devicetree

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/2e8defbce0ded16cfd5a329ee9d5e78ae255cf8b

[C72] Move C72 Nano files to generic C72 directory

We want to unify as much code as possible between C72 Nano and C72 Mini: strap_cfg.h, strap_cfg.c, env_conf.h will be in common