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/sama5d2_xplained_emmc_defconfig b/configs/sama5d2_xplained_emmc_defconfig
index 844a9cd..47672b5 100644
--- a/configs/sama5d2_xplained_emmc_defconfig
+++ b/configs/sama5d2_xplained_emmc_defconfig
@@ -43,6 +43,7 @@
 CONFIG_CMD_MMC=y
 CONFIG_CMD_USB=y
 CONFIG_CMD_DHCP=y
+CONFIG_BOOTP_BOOTFILESIZE=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_HASH=y
 CONFIG_HASH_VERIFY=y