Refactor crc8_dvb_s2 Function for Improved Readability and Maintainability

[MDLZCOOL]

Description: This merge request refactors the crc8_dvb_s2 function to enhance code clarity and maintainability. The main changes include:

• Extracting crc8_dvb_s2 from the MSP class and making it an independent function.
• Replacing the original bitwise implementation with the GENERIC_CRC8 class, improving code readability and maintainability.
• Adding the crc.h header file inclusion in msp.cpp.

These modifications help decouple the function from the MSP class and leverage a more structured approach for CRC-8 calculations. Please review and let me know if any further adjustments are needed.

Testing:

• Verified functionality remains consistent with the previous implementation.
• Ensured no regression in MSP-related features.

Thanks for your time! 🚀