configs: Re-sync almost all of cmd/Kconfig

This syncs up the current cmd/Kconfig and include/configs/ files with the
only exception being CMD_NAND.  Due to how we have used this historically
we need to take further care here when converting.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/vexpress_ca5x2_defconfig b/configs/vexpress_ca5x2_defconfig
index 9e53655..4118b58 100644
--- a/configs/vexpress_ca5x2_defconfig
+++ b/configs/vexpress_ca5x2_defconfig
@@ -10,9 +10,10 @@
 # CONFIG_CMD_LOADB is not set
 # CONFIG_CMD_LOADS is not set
 # CONFIG_CMD_FPGA is not set
-# CONFIG_CMD_ECHO is not set
 # CONFIG_CMD_ITEST is not set
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
 # CONFIG_CMD_NFS is not set
+CONFIG_CMD_PING=y
 # CONFIG_CMD_MISC is not set
 CONFIG_OF_LIBFDT=y