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/rsk7203_defconfig b/configs/rsk7203_defconfig
index 40adf42..b63ad4e 100644
--- a/configs/rsk7203_defconfig
+++ b/configs/rsk7203_defconfig
@@ -17,5 +17,6 @@
 # CONFIG_CMD_SOURCE is not set
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_PING=y
+CONFIG_CMD_CACHE=y
 # CONFIG_CMD_MISC is not set
 CONFIG_USE_PRIVATE_LIBGCC=y