Add missing args to weakly defined PalRtc functions

[ghost]

Summary of changes

This fixes lto type mismatch warnings in 3 functions

[Warning] pal_rtc.h@76,6: type of 'PalRtcCompareSet' does not match original declaration [-Wlto-type-mismatch]
[Warning] pal_rtc.h@73,6: type of 'PalRtcEnableCompareIrq' does not match original declaration [-Wlto-type-mismatch]
[Warning] pal_rtc.h@74,6: type of 'PalRtcDisableCompareIrq' does not match original declaration [-Wlto-type-mismatch]

Closes: #13644

Impact of changes

Migration actions required

Documentation

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@jrobeson, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[paul-szczepanek-arm]

Thanks, could you please revert the accidental style changes? Makes the diff unreadable.

[ghost]

oh, sorry. I didn't realize my vim was still set up that way! i will take care of that.

[ghost]

done

[0xc0170]

CI started

[mbed-ci]

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