Update u-boot and add uenv support

guowenxue

2023-07-26 34d436c8c0fe36d468f8c11ef97a9cfb91486ce9

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FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
SRC_URI:append = " file://uboot-imx-lf-5.15.71-2.2.0.patch "
 
addtask copy_logo after do_unpack before do_configure
do_copy_logo(){
    cp ${BSPDIR}/sources/meta-igkboard/recipes-bsp/u-boot/files/uboot-logo-${MACHINE}.bmp ${S}/tools/logos/lingyun.bmp
}