package/cni-plugins: add missing BR2_USE_MMU dependency on Config.in comment

The main option has a BR2_USE_MMU dependency, so the Config.in comment
should have it as well.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/cni-plugins/Config.in

@@ -13,4 +13,5 @@ config BR2_PACKAGE_CNI_PLUGINS
 comment "cni-plugins needs a glibc or musl toolchain w/ threads"
 	depends on BR2_PACKAGE_HOST_GO_TARGET_ARCH_SUPPORTS && \
 		BR2_PACKAGE_HOST_GO_TARGET_CGO_LINKING_SUPPORTS
+	depends on BR2_USE_MMU
 	depends on !BR2_TOOLCHAIN_HAS_THREADS || BR2_TOOLCHAIN_USES_UCLIBC