arm64: dts: qcom: apq8016-sbc: Rename ov5640 enable-gpios to powerdown-gpios

There are two control lines controlled by GPIO going into ov5640

- Reset
- Powerdown

The driver and yaml expect "reset-gpios" and "powerdown-gpios" there has
never been an "enable-gpios".

Fixes: 39e0ce6c ("arm64: dts: qcom: apq8016-sbc: Add CCI/Sensor nodes")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230811234738.2859417-6-bryan.odonoghue@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/apq8016-sbc.dts

@@ -273,7 +273,7 @@ camera_rear@3b {
 		compatible = "ovti,ov5640";
 		reg = <0x3b>;
 
-		enable-gpios = <&tlmm 34 GPIO_ACTIVE_HIGH>;
+		powerdown-gpios = <&tlmm 34 GPIO_ACTIVE_HIGH>;
 		reset-gpios = <&tlmm 35 GPIO_ACTIVE_LOW>;
 		pinctrl-names = "default";
 		pinctrl-0 = <&camera_rear_default>;