u-boot-variscite: update to latest

Update source revision to add support for DART-MX8M-PLUS and
VAR-SOM-MX8M-PLUS. This commit includes the following changes:

varigit/uboot-imx@fc434c2 Add support for DART-MX8M-PLUS and VAR-SOM-MX8M-PLUS

Signed-off-by: Bruno Bonaldi Teixeira <bruno.t@variscite.com>

recipes-bsp/u-boot/u-boot-common.inc

@@ -6,7 +6,7 @@ DEPENDS += "bison-native"
 UBOOT_SRC ?= "git://github.com/varigit/uboot-imx;protocol=https"
 
 SRCBRANCH = "lf_v2024.04_6.6.23-2.0.0_var01"
-SRCREV = "434e37f0e44946775aaeb936973c3441d605ecf9"
+SRCREV = "fc434c2bf57ac20ce51ac9b35352e7c2497ffe20"
 
 UBOOT_INITIAL_ENV_DEVICE = "sd"