Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index b2072d5..6dfceaa 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -163,7 +163,7 @@
 	offset = ((unsigned long) dispDeviceBase) - base;
 	size = dispDeviceRowBytes * dispDeviceRect[3] + offset
 		+ dispDeviceRect[0];
-	vbase = __ioremap(base, size, pgprot_val(pgprot_noncached_wc(__pgprot(0))));
+	vbase = ioremap_wc(base, size);
 	if (!vbase)
 		return;
 	logicalDisplayBase = vbase + offset;
@@ -232,20 +232,12 @@
 
 int __init btext_find_display(int allow_nonstdout)
 {
-	const char *name;
-	struct device_node *np = NULL; 
+	struct device_node *np = of_stdout;
 	int rc = -ENODEV;
 
-	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
-	if (name != NULL) {
-		np = of_find_node_by_path(name);
-		if (np != NULL) {
-			if (strcmp(np->type, "display") != 0) {
-				printk("boot stdout isn't a display !\n");
-				of_node_put(np);
-				np = NULL;
-			}
-		}
+	if (!of_node_is_type(np, "display")) {
+		printk("boot stdout isn't a display !\n");
+		np = NULL;
 	}
 	if (np)
 		rc = btext_initialize(np);