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/P2020RDB-PC_SPIFLASH_defconfig b/configs/P2020RDB-PC_SPIFLASH_defconfig
index 01ef578..1b6ed86 100644
--- a/configs/P2020RDB-PC_SPIFLASH_defconfig
+++ b/configs/P2020RDB-PC_SPIFLASH_defconfig
@@ -15,6 +15,8 @@
 CONFIG_MPC85xx=y
 # CONFIG_CMD_ERRATA is not set
 CONFIG_TARGET_P2020RDB=y
+CONFIG_SYS_MPC85XX_NO_RESETVEC=y
+CONFIG_SPL_SYS_MPC85XX_NO_RESETVEC=y
 CONFIG_MP=y
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y