Integrate meta-seco-imx/u-boot-seco-imx/seco_lf_v2021.04-gm_seco_conf

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/e65aeb8285ddd7296fed749433fbde97042649be

Integrate u-boot-seco-imx/seco_lf_v2021.04-gm_seco_conf

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/8cc6ff0f81aa460bc5201b00b7525956874b5258

[SECO_CONFIG] fix uninitialized variables error

Initalize the char array local vars of the set_video_specification function, since being used while uninitialized you may find random garbage inside the videomode U-Boot variable.