Add wired headset media button behavior for two calls

Add wired headset media button behavior during active + hold calls.
 - Short press: Swap calls
 - Long press: End current call

Bug: 110373642
Test: manual - Check that calls swap when wired headset media
button short pressed and current call end when wired headset media
button long pressed during two calls.
Test: auto - Passed "lite_test_telecom -c CallLogManagerTest"
Change-Id: Iccc6ec04c9bbe67b74a35d09e032be1ae29b7b6b