arm64: dts: qcom: sc8280xp-pmics: Remove reg entry & use correct node name for pmc8280c_lpg node

Commit eeca7d46 ("arm64: dts: qcom: pm8350c: Drop PWM reg declaration")
dropped PWM reg declaration for pm8350c pwm(s), but there is a leftover
'reg' entry inside the lpg/pwm node in sc8280xp dts file. Remove the same.

While at it, also remove the unused unit address in the node
label.

Also, since dt-bindings expect LPG/PWM node name to be "pwm",
use correct node name as well, to fix the following
error reported by 'make dtbs_check':

  'lpg' does not match any of the regexes

Fixes: eeca7d46 ("arm64: dts: qcom: pm8350c: Drop PWM reg declaration")
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Cc: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220905070240.1634997-1-bhupesh.sharma@linaro.org

arch/arm64/boot/dts/qcom/sc8280xp-pmics.dtsi

@@ -60,9 +60,8 @@ pmc8280c_gpios: gpio@8800 {
 			#interrupt-cells = <2>;
 		};
 
-		pmc8280c_lpg: lpg@e800 {
+		pmc8280c_lpg: pwm {
 			compatible = "qcom,pm8350c-pwm";
-			reg = <0xe800>;
 
 			#address-cells = <1>;
 			#size-cells = <0>;