arm/gn: update to the latest SHA

Recent changes appear to have fixed clang issues.  Unfortunately,
hafnium gn visibility is not done properly.  So, a patch to that is
needed to get it working.

Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-bsp/hafnium/hafnium/0001-work-around-visibility-issue.patch

@@ -0,0 +1,29 @@
+From 4f1ab5944c1042a141a2ce16ec8bf1d12749e41a Mon Sep 17 00:00:00 2001
+From: Jon Mason <jon.mason@arm.com>
+Date: Thu, 27 Oct 2022 20:10:09 +0000
+Subject: [PATCH] work around visibility issue
+
+gn commit 46b572ce4ceedfe57f4f84051bd7da624c98bf01 "fixed" the
+visibility field not applying to public configs.  This caused dtc to
+have issues due to libfdt and others not being specified.  Due to the
+number, it was cleaner to remove the visibility field (which defaults to
+everything being visible).
+
+Upstream-Status: Pending [Not submitted to upstream yet]
+Signed-off-by: Jon Mason <jon.mason@arm.com>
+---
+ BUILD.gn | 1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/BUILD.gn b/BUILD.gn
+index f55560c..d60c3e3 100644
+--- a/BUILD.gn
++++ b/BUILD.gn
+@@ -5,7 +5,6 @@
+ # https://opensource.org/licenses/BSD-3-Clause.
+ 
+ config("libfdt_config") {
+-  visibility = [ ":gtest" ]
+   include_dirs = [
+     "libfdt",
+     "hafnium_inc",

meta-arm/recipes-bsp/hafnium/hafnium_2.7.bb

@@ -18,6 +18,7 @@ SRC_URI = "gitsm://git.trustedfirmware.org/hafnium/hafnium.git;protocol=https;br
            file://0002-arm-hafnium-fix-kernel-tool-linking.patch  \
            file://0003-Fix-build-with-clang-15.patch \
            file://0001-Use-pkg-config-native-to-find-the-libssl-headers.patch;patchdir=third_party/linux \
+           file://0001-work-around-visibility-issue.patch;patchdir=third_party/dtc \
           "
 SRCREV = "79e9522d26fc2a88a44af149034acc27312b73a1"
 S = "${WORKDIR}/git"

meta-arm/recipes-devtools/gn/gn_git.bb

@@ -5,17 +5,12 @@ LICENSE = "BSD-3-Clause"
 LIC_FILES_CHKSUM = "file://LICENSE;md5=0fca02217a5d49a14dfe2d11837bb34d"
 
 SRC_URI = "git://gn.googlesource.com/gn;protocol=https;branch=main"
-SRCREV = "69ec4fca1fa69ddadae13f9e6b7507efa0675263"
+SRCREV = "bf4e17dc67b2a2007475415e3f9e1d1cf32f6e35"
 PV = "0+git${SRCPV}"
 
 S = "${WORKDIR}/git"
 B = "${WORKDIR}/build"
 
-# Currently fails to build with clang, eg:
-# https://errors.yoctoproject.org/Errors/Details/610602/
-# https://errors.yoctoproject.org/Errors/Details/610486/
-TOOLCHAIN = "gcc"
-
 # Map from our _OS strings to the GN's platform values.
 def gn_platform(variable, d):
     os = d.getVar(variable)