board_f: Drop return value from initdram()

At present we cannot use this function as an init sequence call without a
wrapper, since it returns the RAM size. Adjust it to set the RAM size in
global_data instead, and return 0 on success.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/mpl/pip405/pip405.c b/board/mpl/pip405/pip405.c
index 07b30ed..c07d8f8 100644
--- a/board/mpl/pip405/pip405.c
+++ b/board/mpl/pip405/pip405.c
@@ -612,7 +612,7 @@
 /* ------------------------------------------------------------------------- */
 static int test_dram (unsigned long ramsize);
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	unsigned long bank_reg[4], tmp, bank_size;
 	int i, ds;
@@ -648,7 +648,9 @@
 	(void) get_clocks();
 	if (gd->cpu_clk > 220000000)
 		TotalSize /= 2;
-	return (TotalSize * 1024 * 1024);
+	gd->ram_size = TotalSize * 1024 * 1024;
+
+	return 0;
 }
 
 /* ------------------------------------------------------------------------- */