mfd: rave-sp: Add legacy EEPROM access command translation

This is needed to make rave-sp-eeprom driver work on "legacy"
firmware.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/rave-sp.c b/drivers/mfd/rave-sp.c
index aa75d58..a999fa7 100644
--- a/drivers/mfd/rave-sp.c
+++ b/drivers/mfd/rave-sp.c
@@ -635,6 +635,8 @@ static int rave_sp_default_cmd_translate(enum rave_sp_command command)
 		return 0x1E;
 	case RAVE_SP_CMD_RESET_REASON:
 		return 0x1F;
+	case RAVE_SP_CMD_RMB_EEPROM:
+		return 0x20;
 	default:
 		return -EINVAL;
 	}