Fix CTS failed when trigger the remote capability request to the UCE framework

While UCE framework running the initiation and had not registered the capability event listener, CTS triggerred the onRemoteCapabiluityRequest callback to the framework.
It caused that UCE framework didn't receive this callback.

Bug: 183161837
Test: atest CtsTelephonyTestCases:android.telephony.ims.cts.RcsUceAdapterTest#testOptionsRequestFromNetwork --iterations 10
Merged-In: I73328f848ef9914b2f30ee84841cc7c44a7392f3
Change-Id: I58a0d79344985ba08c0de26c2dfb0c555c7570c7