chore(PeriphDrivers): Fix typo

[ozersa]

Description

MXC_LP_EnterShutDownMode function name does not match with .h and .c files. To it match with other part number too, ShutDown prefered instead of Shutdown which match with rest of the usage in the file like MXC_LP_SRCCShutdown ...

See: https://github.com/Analog-Devices-MSDK/msdk/blob/main/Libraries/PeriphDrivers/Include/MAX32660/lp.h#L197 https://github.com/Analog-Devices-MSDK/msdk/blob/main/Libraries/PeriphDrivers/Include/MAX32665/lp.h#L390

Checklist Before Requesting Review

• [X] PR Title follows correct guidelines.
• [X] Description of changes and all other relevant information.
• [ ] (Optional) Link any related GitHub issues using a keyword
• [ ] (Optional) Provide info on any relevant functional testing/validation. For API changes or significant features, this is not optional.