grub: Fix build reproducibility issue

We're seeing reproducibility issue on the autobuilder due to changing
module dependency ordering. Add some sorting to an awk script to fix this.

(From OE-Core rev: 351651925d854a130cfa2d04d4d3f18caa08c873)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 925ddd5edccbfec52ff45c1b54ab2ae1bfe0d57c)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/grub/files/determinism.patch

@@ -0,0 +1,24 @@
+The output in moddep.lst generated from syminfo.lst using genmoddep.awk is
+not deterministic since the order of the dependencies on each line can vary
+depending on how awk sorts the values in the array.
+
+Be deterministic in the output by sorting the dependencies on each line.
+
+Upstream-Status: Pending
+Richard Purdie <richard.purdie@linuxfoundation.org>
+
+Index: grub-2.04/grub-core/genmoddep.awk
+===================================================================
+--- grub-2.04.orig/grub-core/genmoddep.awk
++++ grub-2.04/grub-core/genmoddep.awk
+@@ -59,7 +59,9 @@ END {
+     }
+     modlist = ""
+     depcount[mod] = 0
+-    for (depmod in uniqmods) {
++    n = asorti(uniqmods, w)
++    for (i = 1; i <= n; i++) {
++      depmod = w[i]
+       modlist = modlist " " depmod;
+       inverse_dependencies[depmod] = inverse_dependencies[depmod] " " mod
+       depcount[mod]++

meta/recipes-bsp/grub/grub2.inc

@@ -27,6 +27,7 @@ SRC_URI = "${GNU_MIRROR}/grub/grub-${PV}.tar.gz \
            file://script-Remove-unused-fields-from-grub_script_functio.patch \
            file://CVE-2020-15706-script-Avoid-a-use-after-free-when-redefining-a-func.patch \
            file://CVE-2020-15707-linux-Fix-integer-overflows-in-initrd-size-handling.patch \
+           file://determinism.patch \
 "
 SRC_URI[md5sum] = "5ce674ca6b2612d8939b9e6abed32934"
 SRC_URI[sha256sum] = "f10c85ae3e204dbaec39ae22fa3c5e99f0665417e91c2cb49b7e5031658ba6ea"