soc: arm: align SoC names defined in soc.yml to Kconfig SOC setting

This commit aligns the SoC names for arm an547 SoCs defined in soc.yml
to Kconfig SOC setting.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

soc/arm/mps3/Kconfig.soc

@@ -15,4 +15,4 @@ config SOC_MPS3_AN547
 	select SOC_SERIES_MPS3
 
 config SOC
-	default "mps3_an547" if SOC_MPS3_AN547
+	default "an547" if SOC_MPS3_AN547