ARM: dts: spear320-hmi: correct STMPE GPIO compatible

The compatible is st,stmpe-gpio.

Fixes: e2eb6918 ("ARM: SPEAr320: DT: Add SPEAr 320 HMI board support")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/r/20230225162237.40242-1-krzysztof.kozlowski@linaro.orgSigned-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/spear320-hmi.dts

@@ -241,7 +241,7 @@ stmpe811@41 {
 					irq-trigger = <0x1>;
 
 					stmpegpio: stmpe-gpio {
-						compatible = "stmpe,gpio";
+						compatible = "st,stmpe-gpio";
 						reg = <0>;
 						gpio-controller;
 						#gpio-cells = <2>;