sunxi: SPL: store RAM size in gd

The sunxi SPL was holding the detected RAM size in some local variable
only, so it wasn't accessible for other functions.
Store the value in gd->ram_size instead, so it can be used later on.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 4404edb..4248b47 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -512,7 +512,6 @@
 void sunxi_board_init(void)
 {
 	int power_failed = 0;
-	unsigned long ramsize;
 
 #ifdef CONFIG_SY8106A_POWER
 	power_failed = sy8106a_set_vout1(CONFIG_SY8106A_VOUT1_VOLT);
@@ -573,9 +572,9 @@
 #endif
 #endif
 	printf("DRAM:");
-	ramsize = sunxi_dram_init();
-	printf(" %d MiB\n", (int)(ramsize >> 20));
-	if (!ramsize)
+	gd->ram_size = sunxi_dram_init();
+	printf(" %d MiB\n", (int)(gd->ram_size >> 20));
+	if (!gd->ram_size)
 		hang();
 
 	/*