arm64: dts: qcom: sc7180: Fix DSI0_PHY reg-names

Commit 2b616f86 ("arm64: dts: qcom: sc7180: rename labels for DSI
nodes") broke reg-names, possibly with search-and-replace. Fix it.

Fixes: 2b616f86

 ("arm64: dts: qcom: sc7180: rename labels for DSI nodes")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230627-topic-more_bindings-v1-1-6b4b6cd081e5@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>