Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/scripts/atomic/fallbacks/acquire b/scripts/atomic/fallbacks/acquire
new file mode 100755
index 0000000..e38871e
--- /dev/null
+++ b/scripts/atomic/fallbacks/acquire
@@ -0,0 +1,9 @@
+cat <<EOF
+static inline ${ret}
+${atomic}_${pfx}${name}${sfx}_acquire(${params})
+{
+	${ret} ret = ${atomic}_${pfx}${name}${sfx}_relaxed(${args});
+	__atomic_acquire_fence();
+	return ret;
+}
+EOF