[imx8mp] reduce u-boot booting time

[ESK]

When I check "iMX_Boot_Times.pdf" booting time of imx8mq was 10.6s until "login prompt"

But my imx8mp takes 16.6s

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So, I try to reduce "U-boot : Starting kernel" time as a first step.

But, It task 2.8s. What can I do for 1.896s(imx8mq, iMX_Boot_Times.pdf)

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    1) When I try below all, it can't boot up to kernel.
        ESK_3-1649131377177.png
        ESK_4-1649131418014.png

    2) When I modify "CONFIG_VIDEO_ADV7535=y" to "# CONFIG_VIDEO_ADV7535 is not set" u-boot taks time 1.2s more, 4.048s.

    3) "u-boot : starting kernel" 2.849s log.

 ESK_5-1649131888751.png

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