arm: atmel: sama5d3: correct the ID for DBGU and PIT

As the DBGU and PIT has its own ID on sama5d3 SoC, while not share
with SYS ID. So, correct them.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>