board/BuR/tseries: only run gpmc_init(...) in NAND-build

if we have no NAND-Chip, we don't need the gpmc-controller and therefore
is no need to init it.

Cc: trini@ti.com
Signed-off-by: Hannes Petermaier <oe5hpm@oevsv.at>

board/BuR/tseries/board.c

@@ -117,7 +117,9 @@ void sdram_init(void)
 int board_init(void)
 {
 	gd->bd->bi_boot_params = CONFIG_SYS_SDRAM_BASE + 0x100;
+#ifdef CONFIG_NAND
 	gpmc_init();
+#endif
 	return 0;
 }