configs: Re-sync with cmd/Kconfig

Update the config.h and defconfig files for the commands that 8e3c036
converted over to Kconfig

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/yellowstone_defconfig b/configs/yellowstone_defconfig
index 2f1cea2..00992e0 100644
--- a/configs/yellowstone_defconfig
+++ b/configs/yellowstone_defconfig
@@ -4,9 +4,13 @@
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="YELLOWSTONE"
 CONFIG_HUSH_PARSER=y
+CONFIG_CMD_ASKENV=y
+CONFIG_CMD_GREPENV=y
 CONFIG_LOOPW=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_CACHE=y
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y