dts: silabs: Fix minor soc dts issues #31147
                
     Merged
            
            
          
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The gpio interrupt numbers were wrong for the efm32jg12b, efm32pg12b and efr32mg. This had no effect, since these device tree properties are not used by the gpio driver. Instead the hard-coded defines from the hal are used there, see https://github.com/zephyrproject-rtos/zephyr/blob/master/drivers/gpio/gpio_gecko.c#L292
Some unrelated node were nested inside the gpio node. This seems to have no effect and no script/tool noticed it.