arm64: dts: qcom: sdm850-*: fix uart6 aliases

This is a follow up on a previous patch[1] fixing the aliases for
sdm845 devices, fix them here too.

[1]: 4772c030 ("arm64: dts: qcom: sdm845-*: fix uart6 aliases")

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
Link: https://lore.kernel.org/r/20230627-c630-uart-and-1p2-reg-v2-3-496b581935c1@linaro.org


Signed-off-by: Bjorn Andersson <andersson@kernel.org>