omap4_sdp4430: Disable SPL_OS_BOOT

We are tight on space on this board so drop SPL_OS_BOOT

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/omap4_sdp4430_defconfig b/configs/omap4_sdp4430_defconfig
index 57dcf32..de339ca 100644
--- a/configs/omap4_sdp4430_defconfig
+++ b/configs/omap4_sdp4430_defconfig
@@ -8,7 +8,6 @@
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_VERSION_VARIABLE=y
 CONFIG_SPL=y
-CONFIG_SPL_OS_BOOT=y
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_ASKENV=y
 # CONFIG_CMD_FLASH is not set