board/olimex/a20_olinuxino/genimage.cfg: beautify file

Beatify this genimage .cfg file to have consistency with all genimage .cfg
files in Buildroot.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

board/olimex/a20_olinuxino/genimage.cfg

@@ -5,8 +5,8 @@ image sdcard.img {
 	partition u-boot {
 		in-partition-table = "no"
 		image = "u-boot-sunxi-with-spl.bin"
-		offset = 8192
-		size = 1040384 # 1MB - 8192
+		offset = 8KB
+		size = 1016K # 1MB - 8KB
 	}
 
 	partition rootfs {