arm64: dts: qcom: drop underscore in node names

Underscores should not be used in node names (dtc with W=2 warns about
them), so replace them with hyphens.

Functional impact checked with comparing before/after DTBs with dtx_diff
and fdtdump.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konradybcio@kernel.org>
Link: https://lore.kernel.org/r/20240905-dts-cleanup-v1-3-f4c5f7b2c8c2@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/qcs8550.dtsi

@@ -154,7 +154,7 @@
 			no-map;
 		};
 
-		mpss_dsm_mem: mpss_dsm_region@d4d00000 {
+		mpss_dsm_mem: mpss-dsm-region@d4d00000 {
 			reg = <0x0 0xd4d00000 0x0 0x3300000>;
 			no-map;
 		};

arch/arm64/boot/dts/qcom/sdm450-lenovo-tbx605f.dts

@@ -40,7 +40,7 @@
 	};
 
 	reserved-memory {
-		other_ext_region@0 {
+		other-ext-region@0 {
 			no-map;
 			reg = <0x00 0x84500000 0x00 0x2300000>;
 		};

arch/arm64/boot/dts/qcom/sm8550-samsung-q5q.dts

@@ -98,7 +98,7 @@
 		 * The bootloader will only keep display hardware enabled
 		 * if this memory region is named exactly 'splash_region'
 		 */
-		splash_region@b8000000 {
+		splash-region@b8000000 {
 			reg = <0x0 0xb8000000 0x0 0x2b00000>;
 			no-map;
 		};