mfd: Add 8420 variant to db8500-prcmu

Signed-off-by: Bengt Jonsson <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/db8500-prcmu.c

···
 		return "U9500 C2";
 	case PRCMU_FW_PROJECT_U8520:
 		return "U8520";
+	case PRCMU_FW_PROJECT_U8420:
+		return "U8420";
 	default:
 		return "Unknown";
 	}

include/linux/mfd/db8500-prcmu.h

···
 #define PRCMU_FW_PROJECT_U8500_C2	7
 #define PRCMU_FW_PROJECT_U9500_C2	11
 #define PRCMU_FW_PROJECT_U8520		13
+#define PRCMU_FW_PROJECT_U8420		14
 
 struct prcmu_fw_version {
 	u8 project;