Enable u-boot recipes without freescale layer

Move the recipes from dynamic layer to the normal folder.
Add missing class from meta-freescale.

BCS 746-001392

classes/uuu_bootloader_tag.bbclass

+# Append a tag to the bootloader image used in the SD card image. The tag
+# contains the size of the bootloader image so UUU can easily find the end of
+# the bootloader in the SD card image.
+do_deploy:append() {
+    if [ "${UUU_BOOTLOADER}" != "" ]; then
+        cp ${DEPLOYDIR}/${UUU_BOOTLOADER}   ${DEPLOYDIR}/${UUU_BOOTLOADER_TAGGED}
+        ln -sf ${UUU_BOOTLOADER_TAGGED}     ${DEPLOYDIR}/${UUU_BOOTLOADER}
+        stat -L -cUUUBURNXXOEUZX7+A-XY5601QQWWZ%sEND ${DEPLOYDIR}/${UUU_BOOTLOADER} \
+                                         >> ${DEPLOYDIR}/${UUU_BOOTLOADER}
+    fi
+}

conf/machine/seco-mx6.conf

@@ -9,6 +9,13 @@ require conf/machine/include/arm/armv7a/tune-cortexa9.inc
 MACHINEOVERRIDES =. "imxipu:imxvpu:imxgpu2d:imxgpu3d:"
 SOC_FAMILY = "imx:mx6:mx6q"
 
+UBOOT_CONFIG ??= "sd"
+# Not sure, if UBOOT_MACHINE or UBOOT_CONFIG should be set to select the proper platform.
+# Setting both is not possible.
+UBOOT_CONFIG[sd] = "seco-mx6_defconfig,sdcard"
+
+UBOOT_DTB_NAME = "imx6q-san.dtb"
+
 SANTVEND_PRESHUTDOWN_SCRIPTS = " \
     shutdown-pwr-check \
     restore-wakeup-ok \

dynamic-layers/freescale-layer/recipes-bsp/u-boot/u-boot-imx_%.bbappend → recipes-bsp/u-boot/u-boot-imx_%.bbappend

@@ -3,7 +3,7 @@ FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
 # Get include file from poky layer
 FILESEXTRAPATHS:append := "${BSPDIR}/sources/poky/meta/recipes-bsp/u-boot/files:"
 
-COMPATIBLE_MACHINE = "(seco-mx8mm|seco-mx8mp)"
+COMPATIBLE_MACHINE = "(seco-mx8mm|seco-mx8mp|seco-mx6)"
 
 SRCBRANCH = "guf_imx_v2020.04-trizeps8plus_2021_12_07"
 PV = "2020.04"