TI:am33xx: Move SPL YMODEM support to the per-board config

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/ti_am335x_common.h b/include/configs/ti_am335x_common.h
index 837c02c..d2e34ae 100644
--- a/include/configs/ti_am335x_common.h
+++ b/include/configs/ti_am335x_common.h
@@ -49,7 +49,6 @@
  */
 #define CONFIG_SPL_TEXT_BASE		0x402F0400
 #define CONFIG_SPL_MAX_SIZE		(0x4030B800 - CONFIG_SPL_TEXT_BASE)
-#define CONFIG_SPL_YMODEM_SUPPORT
 
 /*
  * Since SPL did pll and ddr initialization for us,