common: Move RAM-sizing functions to init.h

These functions relate to memory init so move them into the init
header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/broadcom/bcm23550_w1d/bcm23550_w1d.c b/board/broadcom/bcm23550_w1d/bcm23550_w1d.c
index ce9f049..d83eb9b 100644
--- a/board/broadcom/bcm23550_w1d/bcm23550_w1d.c
+++ b/board/broadcom/bcm23550_w1d/bcm23550_w1d.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <asm/io.h>
 #include <asm/mach-types.h>
 #include <env.h>
diff --git a/board/broadcom/bcm28155_ap/bcm28155_ap.c b/board/broadcom/bcm28155_ap/bcm28155_ap.c
index 8761638..40ced1a 100644
--- a/board/broadcom/bcm28155_ap/bcm28155_ap.c
+++ b/board/broadcom/bcm28155_ap/bcm28155_ap.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <init.h>
 #include <asm/io.h>
 #include <asm/mach-types.h>
 #include <env.h>
diff --git a/board/broadcom/bcm_ep/board.c b/board/broadcom/bcm_ep/board.c
index 63fb98b..e4dbe42 100644
--- a/board/broadcom/bcm_ep/board.c
+++ b/board/broadcom/bcm_ep/board.c
@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <cpu_func.h>
+#include <init.h>
 #include <asm/io.h>
 #include <config.h>
 #include <netdev.h>
diff --git a/board/broadcom/bcmns2/northstar2.c b/board/broadcom/bcmns2/northstar2.c
index 292802f..6cbad9c 100644
--- a/board/broadcom/bcmns2/northstar2.c
+++ b/board/broadcom/bcmns2/northstar2.c
@@ -4,6 +4,7 @@
  */
 #include <common.h>
 #include <cpu_func.h>
+#include <init.h>
 #include <asm/system.h>
 #include <asm/armv8/mmu.h>