mpc85xx: rename sdram_init() lbc_sdram_init()

sdram_init() is used to initialize sdram on the lbc.  Rename it
accordingly.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/board/freescale/mpc8548cds/mpc8548cds.c b/board/freescale/mpc8548cds/mpc8548cds.c
index a4a35fa..8ad6b22 100644
--- a/board/freescale/mpc8548cds/mpc8548cds.c
+++ b/board/freescale/mpc8548cds/mpc8548cds.c
@@ -111,8 +111,7 @@
 /*
  * Initialize SDRAM memory on the Local Bus.
  */
-void
-sdram_init(void)
+void lbc_sdram_init(void)
 {
 #if defined(CONFIG_SYS_OR2_PRELIM) && defined(CONFIG_SYS_BR2_PRELIM)