drivers: counter: sam: Add qdec as tc special mode

The current atmel,sam-tc-qdec sensor implementation shared the timer
counter node. This create issues when users wants define both modes.
The current proposal changes the qdec dedinition to be a child of
tc and refactor all the chain of definitions.

Fixes #71312

Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>