Avoid double lookup in cdm association store

This CL avoids unnecessary calls to getDeviceMacAddress() in the
updateAssociations method.

Test: atest CtsCompanionDeviceManagerCoreTestCases
Test: atest CtsCompanionDeviceManagerUiAutomationTestCases
Change-Id: I35cfb24afe6ad3345347fe9e385935fea481407f
1 file changed