arm: pdu001: Fix dt to work with the current am33xx dtsi files

The changes introduced with commit 6337d53fdf45 ("arm: dts: sync am33xx
with Linux 5.9-rc7") prevent the PDU001 from operating correctly.
This patch fixes the configuration of the pin multiplexer and uart3.

Signed-off-by: Felix Brack <fb@ltec.ch>
2 files changed