[riot-notifications] [RIOT-OS/RIOT] boards/stm32l4/wb: add Kconfig for clock configuration (#14968)

[Leandro Lanzieri]

Strangely two sources seem to be active on the macro side:
```C
#if IS_ACTIVE(CONFIG_CLOCK_PLL_SRC_HSE)
#warning "HSE as PLL src"
#endif

#if IS_ACTIVE(CONFIG_CLOCK_PLL_SRC_HSI)
#warning "HSI as PLL src"
#endif
```

```
/home/leandro/Work/git/riot-temp/cpu/stm32/stmclk/stmclk_l4wb.c:248:2: error: #warning "HSE as PLL src" [-Werror=cpp]
 #warning "HSE as PLL src"
  ^~~~~~~
/home/leandro/Work/git/riot-temp/cpu/stm32/stmclk/stmclk_l4wb.c:252:2: error: #warning "HSI as PLL src" [-Werror=cpp]
 #warning "HSI as PLL src"
```


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