board/orangepi/orangepi-pc2/genimage.cfg: fix comment

For consistency comment '# 1MB - 40K' must be '# 1MB - 40KB'.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

board/orangepi/orangepi-pc2/genimage.cfg

@@ -24,7 +24,7 @@ image sdcard.img {
 		in-partition-table = "no"
 		image = "u-boot.itb"
 		offset = 40K
-		size = 1M # 1MB - 40K
+		size = 1M # 1MB - 40KB
 	}
 
 	partition boot {