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/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
index 7818d72..542543c 100644
--- a/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
+++ b/arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c
@@ -8,6 +8,7 @@
 
 #include <common.h>
 #include <config.h>
+#include <init.h>
 #include <asm/io.h>
 #include <asm/arch/imx-regs.h>
 #include <asm/arch/sys_proto.h>
diff --git a/arch/arm/cpu/arm926ejs/spear/spr_misc.c b/arch/arm/cpu/arm926ejs/spear/spr_misc.c
index ccf944f..d5be646 100644
--- a/arch/arm/cpu/arm926ejs/spear/spr_misc.c
+++ b/arch/arm/cpu/arm926ejs/spear/spr_misc.c
@@ -9,6 +9,7 @@
 #include <cpu_func.h>
 #include <env.h>
 #include <i2c.h>
+#include <init.h>
 #include <net.h>
 #include <linux/mtd/st_smi.h>
 #include <asm/io.h>