Integrate uboot-imx-kuk/cherry-pick-47242cec

Commit: seco-ne/3rd-party/kuk/uboot-imx-kuk@a480fd4d

defconfig: Added missing raw initramfs and realtek driver

Added the support for old and raw initramfs images to U-Boot. Also added the driver for Realtek phys to U-Boot.

(cherry picked from commit 47242cec318ca16fd56cab2704563fedd5aa471f)