Add link to upstream submission to build script

Signed-off-by: Loïc Minier <[email protected]>

Author: lool

scripts/build-u-boot-rb1.sh

@@ -2,6 +2,8 @@
 
 set -eu
 
+# patches in this repo/branch were submitted upstream here:
+# https://lore.kernel.org/u-boot/[email protected]/
 GIT_REPO="https://github.com/b49020/u-boot"
 GIT_BRANCH="qcom-mainline"
 CONFIG="qcom_defconfig"