APB2 SDMMC clocking not enabled for STM32L4 series

[snakehand]

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I am trying to get a SDMMC example working on STM32L431 and discovered that the SDMMC peripheral was not clocked by the APB2 clock unless I added the following code:

unsafe {
    pac::RCC.apb2enr().modify(|w| w.set_sdmmcen(true));
}

[MabezDev]

Feel free to submit a PR to enable the register for your chip during SDMMC initialization :)