Update Kconfiglib to improve generated documentation

[ulfalizer]

There are currently two issues with the fix for #6821 (pull request: #6843) that require a Kconfiglib update to resolve:

• FOO is not turned into a link for select FOO and imply FOO. This will be fixed by ulfalizer/Kconfiglib@a5ea0dc.

• A && B || C && D should be rendered as (A && B) || (C && D), for clarity. This is a trivial fix.

[ulfalizer]

@carlescufi

[ulfalizer]

Fix for second issue: ulfalizer/Kconfiglib@7245bad