Integrate meta-seco-imx/u-boot-seco-imx/splash2

Commit: https://git.seco.com/edgehog/layers/seco/meta-seco-imx/-/commit/e0f130a05edec9ac99f650529f5daa2ef445a082

Integrate u-boot-seco-imx/splash2

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/f36e01ee6daaea86cb7bc4c1db2ffefd8d270355

[SPLASH][ENV] add splashsource var to seco_environment.h

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/9dc37a5f74e487b72c344b2daaff0b658bd3fd33

[SPLASH] set logo-pos and logo-count in bootargs

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/5dbe4c199fb8f86e897c50e7bdc5a38c6d352f16

[SPLASH] enable splash screen and splashsource for seco boards

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Commit: https://git.seco.com/edgehog/bsp/nxp/u-boot-seco-imx/-/commit/b81a3404fbd5a9257bdb3344fccdeabc8fabafb7

[SPLASH] add implementation for splash_screen_prepare