HDMI-CEC: Don't initiate ARC repeatedly [1/1]

For specific AVRs, they could respond to the <Request SAD> message late. Besides, the TV could initiate ARC with <Initiate ARC> message even when ARC has already been initialized.

This patch proposed below solution:
1. Add the retry times to request sad.
2. Don't initiate ARC when it is already established.

Test: verified by vendor and atest HdmiCecLocalDeviceTvTest
Bug: 358741591
Flag: EXEMPT bugfix
Change-Id: Ifb1a4c875b10c54db567e2188a7ab9cf6623e2b7
Signed-off-by: an.xi <an.xi@amlogic.com>