kconfig: soften the INFO msg for preferred kconfig option values

Clayton Craftrequested to merge
craftyguy/kconfig-softer-info into master

Using "should be set" in an INFO msg like this is misleading, this is just a recommendation. Now it shows something like:

CONFIG_VFAT_FS is preferably y, but currently m (category:uefi)
CONFIG_NTFS3_FS is preferably y, but currently m (category:uefi)
Edited by Clayton Craft

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