kconfiglib: Update to add list of choices

Update Kconfiglib to upstream revision 9fba375c65341 (+ local Zephyr
modifications) to get commit 94020beb311eb ("Make Kconfig._choices
public") in. It will be used to generate Kconfig reference pages for
choices.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>
1 file changed