Convert CONFIG_SYS_MPC85XX_NO_RESETVEC to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_MPC85XX_NO_RESETVEC

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/T4240RDB_SDCARD_defconfig b/configs/T4240RDB_SDCARD_defconfig
index c08a96e..462e52f 100644
--- a/configs/T4240RDB_SDCARD_defconfig
+++ b/configs/T4240RDB_SDCARD_defconfig
@@ -16,6 +16,7 @@
 CONFIG_SPL=y
 CONFIG_MPC85xx=y
 CONFIG_TARGET_T4240RDB=y
+CONFIG_SYS_MPC85XX_NO_RESETVEC=y
 CONFIG_MP=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y