kconfiglib: Update to 7245bad9ebb58

Update Kconfiglib to upstream revision 7245bad9ebb58 (+ local Zephyr
modifications), to get the following improvements/fixes in:

 - Print a warning if an int or hex symbol is assigned a value that lies
   outside an active 'range' constraint.

 - Turn 'FOO' into a link in 'select FOO' when generating the Kconfig
   reference documentation.

 - Parenthesize '&&' expressions within '||' expressions --
   (A && B) || (C && D) is more readable than A && B || C && D.

The final two fixes will only be visible once the fix for #5622 gets in.

Fixes #6749
Fixes #6844

Origin: https://github.com/zephyrproject-rtos/Kconfiglib/tree/zephyr



Signed-off-by: Ulf Magnusson <ulfalizer@gmail.com>