Export hal_spi_get_clock_divider()

[XuGuohui]

NOTE: this PR is targeting the feature/muon-som-evb branch

Problem

The hal_spi_get_clock_divider() is invoked by spi_lock.h. Under some circumstances, e.g. the IO expander driver that is copied from DVOS and is used in user application, the user application may fail to compile.

Solution

Add hal_spi_get_clock_divider() to the dynalib table.

References

N/A

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Completeness

• [x] User is totes amazing for contributing!
• [x] Contributor has signed CLA (Info here)
• [x] Problem and Solution clearly stated
• [ ] Run unit/integration/application tests on device
• [ ] Added documentation
• [ ] Added to CHANGELOG.md after merging (add links to docs and issues)