arm64: dts: qcom: sdm845-sony-xperia-tama: Correct uart instances

arm64: dts: qcom: sdm845-sony-xperia-tama: Correct uart instances

Change the uart instances:
- uart6 is for bluetooth
- uart9 is for serial console (available on the uSD pinout)

Most OSes assume serial0 is for console UART. Bluetooth interface uses
UART interface. uart6 is standard debug console and uart9 bluetooth on
SDM845 devices.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: David Heidelberg <david@ixit.cz>
Signed-off-by: Petr Hodina <petr.hodina@protonmail.com>
Link: https://lore.kernel.org/r/20260120-akatsuki-uart-v2-1-867ee7f042d0@protonmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>