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/mpc8560ads/mpc8560ads.c b/board/freescale/mpc8560ads/mpc8560ads.c
index 49701ef..26a64a3 100644
--- a/board/freescale/mpc8560ads/mpc8560ads.c
+++ b/board/freescale/mpc8560ads/mpc8560ads.c
@@ -327,9 +327,7 @@
 /*
  * Initialize SDRAM memory on the Local Bus.
  */
-
-void
-sdram_init(void)
+void lbc_sdram_init(void)
 {
 	volatile fsl_lbc_t *lbc = LBC_BASE_ADDR;
 	uint *sdram_addr = (uint *)CONFIG_SYS_LBC_SDRAM_BASE;