tests: bluetooth: tester: Add support for advertising with target RPA

This allows to do directed advertising with peer address set to RPA.
To do this according to specification IUT must first read Central
Address Resolution characteristic to check if peer supports it.

This is affecting GAP/CONN/DCON/BV-05-C qualification test.

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>