ti: boot: Register the MMC controllers in SPL in the same way as in u-boot

To keep a consistent MMC device mapping in SPL and in u-boot, let's
register the MMC controllers the same way in u-boot and in the SPL.
In terms of boot time, it doesn't hurt to register more controllers than
needed because the MMC device is initialized only prior being accessed for
the first time.
Having the same device mapping in SPL and u-boot allows us to use the
environment in SPL whatever the MMC boot device.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
diff --git a/board/ti/panda/panda.c b/board/ti/panda/panda.c
index 13b5daf..187ff3c 100644
--- a/board/ti/panda/panda.c
+++ b/board/ti/panda/panda.c
@@ -287,17 +287,19 @@
 			   sizeof(struct pad_conf_entry));
 }
 
-#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_GENERIC_MMC)
+#if defined(CONFIG_GENERIC_MMC)
 int board_mmc_init(bd_t *bis)
 {
 	return omap_mmc_init(0, 0, 0, -1, -1);
 }
 
+#if !defined(CONFIG_SPL_BUILD)
 void board_mmc_power_init(void)
 {
 	twl6030_power_mmc_init(0);
 }
 #endif
+#endif
 
 #ifdef CONFIG_USB_EHCI