These symbols are already within an 'if MODEM_WNCM14A2A', so no need to
put 'depends on MODEM_WNCM14A2A' on them.
Also remove a redundant 'depends on MODEM' from MODEM_WNCM14A2A.
drivers/modem/Kconfig.wncm14a2a is already sourced within an 'if MODEM',
in drivers/modem/Kconfig.
'if FOO' is just shorthand for adding 'depends on FOO' to each item
within the 'if'. Dependencies on menus work similarly. There are no
"conditional includes" in Kconfig, so 'if FOO' has no special meaning
around a source. Conditional includes wouldn't be possible, because an
if condition could include (directly or indirectly) forward references
to symbols not defined yet.
Tip: When adding a symbol, check its dependencies in the menuconfig
('ninja menuconfig', then / to jump to the symbol). The menuconfig also
shows how the file with the symbol got included, so if you see
duplicated dependencies, it's easy to hunt down where they come from.
Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>