kconfig: print option value pref. in warning about missing config

Clayton Craftrequested to merge
craftyguy/kconfig-helpful-warn into master

Currently the warning just says an option must be enabled, then yells at you (in an INFO msg) if you incorrectly guess the preferred value. With this change, the preferred value is stated up front in the warning.

● pmbootstrap kconfig check linux-postmarketos-qcom-sc7280
...
WARNING: config-postmarketos-qcom-sc7280.aarch64: CONFIG_SYN_COOKIES should be enabled and preferably set to 'y' (category:default)
...

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