drivers: stm32_hal: stm32_rng Fix compile errors for stm32l4 rng.

[mihnen]

The low level function names in the stm32l4xx low level driver are different than all the other stm32's even though the functionality is the same. This breaks the entropy module for these parts. This patch fixes the build and has been tested on a custom stm32l4p5 board.

Fixes: #88621

[github-actions]

Hello @mihnen, and thank you very much for your first pull request to the Zephyr project!
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[mathieuchopstm]

Just requesting a few changes to the commit message:

-drivers: stm32_hal: stm32_rng Fix compile errors for stm32l4 rng.
+drivers: entropy: stm32: fix compile errors for STM32L4 series

The low level function names in the stm32l4xx low level driver are
different than all the other stm32's even though the functionality is the
same. This breaks the entropy module for these parts. This patch fixes the
build and has been tested on a custom stm32l4p5 board.

+This STM32CubeL4 issue has been reported (ST Internal Reference: 207828).

Fixes: https://github.com/zephyrproject-rtos/zephyr/issues/88621

Signed-off-by: Matt Ihnen <[email protected]>

(git commit --amend to edit the message + force push should avoid a new run of CI)

[mathieuchopstm]

Minor typo remaining in commit message 😅 (Interval -> Internal)

- This STM32CubeL4 issue has been reported (ST Interval Reference: 207828).
+ This STM32CubeL4 issue has been reported (ST Internal Reference: 207828).

[github-actions]

Hi @mihnen!
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