Fix CDM "primary" tag in CTS tests

Use the correct "android.companion.primary" tag in the declaration of
PrimaryCompanionService in cts-companion-common module.

Bug: 198539218
Test: atest CtsCompanionDeviceManagerCoreTestCases
Test: atest CtsCompanionDeviceManagerUiAutomationTestCases
Change-Id: Idbe4985fb0482357aff5be77a713cc5d751d3053
1 file changed