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/ibf-dsp561_defconfig b/configs/ibf-dsp561_defconfig
index 7237cfe..5ce6abc 100644
--- a/configs/ibf-dsp561_defconfig
+++ b/configs/ibf-dsp561_defconfig
@@ -6,4 +6,5 @@
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
 CONFIG_CMD_DNS=y
+CONFIG_CMD_CACHE=y
 CONFIG_LIB_RAND=y