payloads/LinuxBoot: Fix u-root branch

It looks like the u-root 'master' branch was renamed to 'main'.

Change-Id: I384ba66289a49bf226b505615bd16bdf85612c1a
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62590
Reviewed-by: Christian Walter <christian.walter@9elements.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/payloads/external/LinuxBoot/Kconfig b/payloads/external/LinuxBoot/Kconfig
index a1e4e1f..b4bb053 100644
--- a/payloads/external/LinuxBoot/Kconfig
+++ b/payloads/external/LinuxBoot/Kconfig
@@ -177,15 +177,15 @@
 
 choice
 	prompt "U-root version"
-	default LINUXBOOT_UROOT_MASTER
+	default LINUXBOOT_UROOT_MAIN
 
 config LINUXBOOT_UROOT_CUSTOM
 	bool "custom"
 	help
 	  choose a custom u-root branch
 
-config LINUXBOOT_UROOT_MASTER
-	bool "master"
+config LINUXBOOT_UROOT_MAIN
+	bool "main"
 	help
 	  Latest u-root version
 
@@ -207,7 +207,7 @@
 config LINUXBOOT_UROOT_VERSION
 	string
 	default LINUXBOOT_UROOT_CHECKOUT if LINUXBOOT_UROOT_CUSTOM
-	default "master" if LINUXBOOT_UROOT_MASTER
+	default "main" if LINUXBOOT_UROOT_MAIN
 	default "v3.0.0" if LINUXBOOT_UROOT_V3_0_0
 	default "v2.0.0" if LINUXBOOT_UROOT_V2_0_0
 	default "v1.0.0" if LINUXBOOT_UROOT_V1_0_0
diff --git a/payloads/external/LinuxBoot/targets/u-root.mk b/payloads/external/LinuxBoot/targets/u-root.mk
index 0cf91fe..af2f95a 100644
--- a/payloads/external/LinuxBoot/targets/u-root.mk
+++ b/payloads/external/LinuxBoot/targets/u-root.mk
@@ -39,7 +39,7 @@
 
 get: version
 	if [ -d "$(go_path_dir)/src/$(uroot_package)" ]; then \
-	git -C $(go_path_dir)/src/$(uroot_package) checkout --quiet master; \
+	git -C $(go_path_dir)/src/$(uroot_package) checkout --quiet main; \
 	GOPATH=$(go_path_dir) go get -d -u -v $(uroot_package) || \
 	echo -e "\n<<u-root package update failed>>\n"; \
 	else \