Convert CONFIG_BOOTP_MAY_FAIL et al to Kconfig

This converts the following to Kconfig:
   CONFIG_BOOTP_MAY_FAIL
   CONFIG_BOOTP_VENDOREX
   CONFIG_BOOTP_BOOTFILESIZE
   CONFIG_BOOTP_NISDOMAIN
   CONFIG_BOOTP_TIMEOFFSET

Cc: Ramon Fried <rfried.dev@gmail.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/brppt1_nand_defconfig b/configs/brppt1_nand_defconfig
index 551eda8..0561e62 100644
--- a/configs/brppt1_nand_defconfig
+++ b/configs/brppt1_nand_defconfig
@@ -54,6 +54,7 @@
 CONFIG_CMD_USB=y
 # CONFIG_CMD_ITEST is not set
 CONFIG_CMD_DHCP=y
+CONFIG_BOOTP_MAY_FAIL=y
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y