samples: bluetooth: direct_test_mode: add Set Event Mask HCI command

[ivaniushkov]

It was found that some of the RFPHY testers use
HCI LE Set Event Mask command.
This commit adds dummy handlers of the HCI LE Set Event Mask and HCI Set Event Mask commands with no actual implementation. The handlers simply return success code to the commands to allow proceeding the test implementation.

[NordicBuilder]

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Build number: 1

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Enabled	Name	Description
	ci-disabled	Disable the ci execution
	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

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Test Spec & Results: ✅ Success; ❌ Failure; 🟠 Queued; 🟡 Progress; ◻️ Skipped; ⚠️ Quarantine

• ❌ Toolchain
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• ❌ Integration tests

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