ARM: dts: qcom: msm8226-motorola-falcon: specify vddio_disp output voltage

After some digging in downstream sources, it was found that the vddio_disp
regulator's output voltage is 1.8V. This is further confirmed by the
troubleshooting guide. Specify its output voltage as such.
While at it, add a comment specifying the IC, which according to the
schematic is the TI TPS22902.

Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/6143603464a65aebbed281fe6c6164316dd07269.1746711762.git.stano.jakubek@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

Author: Stanislav Jakubek

arch/arm/boot/dts/qcom/msm8226-motorola-falcon.dts

@@ -62,9 +62,12 @@
 		};
 	};
 
+	/* TI TPS22902 */
 	vddio_disp_vreg: regulator-vddio-disp {
 		compatible = "regulator-fixed";
 		regulator-name = "vddio_disp";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
 		gpio = <&tlmm 34 GPIO_ACTIVE_HIGH>;
 		vin-supply = <&pm8226_l8>;
 		startup-delay-us = <300>;