common/board_r: Restore non-cached memory setup

This fixes a regression of e310b93ec1, affecting Ethernet on the Jetson
TK1, e.g.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
diff --git a/common/board_r.c b/common/board_r.c
index 38be09b..0335f6b 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -271,6 +271,14 @@
 	return 0;
 }
 
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+static int initr_noncached(void)
+{
+	noncached_init();
+	return 0;
+}
+#endif
+
 #ifdef CONFIG_DM
 static int initr_dm(void)
 {
@@ -698,6 +706,9 @@
 #endif
 	initr_barrier,
 	initr_malloc,
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
+	initr_noncached,
+#endif
 	bootstage_relocate,
 #ifdef CONFIG_DM
 	initr_dm,