main/u-boot: fix update-u-boot for cubiboard

fixes #8980

main/u-boot/APKBUILD

@@ -3,7 +3,7 @@
 # Maintainer: Leonardo Arena <rnalrd@alpinelinux.org>
 pkgname=u-boot
 pkgver=2018.05
-pkgrel=0
+pkgrel=1
 pkgdesc="u-boot bootloader common files"
 url="http://www.denx.de/wiki/U-Boot/"
 arch="armhf aarch64"
@@ -105,4 +105,4 @@ done
 
 sha512sums="218f71282c9d027b0faf210ce2d4d713779e0c61ea4a23f03d5dec0ca8836a3c26b46c5e258d583834f5b5a2f4663f98729ca4b0101a60f85457eb892f8370d2  u-boot-2018.05.tar.bz2
 f8c9bb6e84d6f0620c976ac7ad5dd7ec7ff9dfdd4b1d03d2bf6653e7beccf80bdf2debfc92fb1f696dba92fb40287d3c45897e0078951451d0835cb61a5f16d1  README.txt
-c860f2cd6fe0ad9a462ac12a7df24b621ac53a07ada21a53791fd14f73c08619adb1f70a61507cc0b531c7beb1953ea8224b8dca5585a5d11b8df43d9ee0ac76  update-u-boot"
+b3b4fb70c4eea2034bae45c513bca7b738be7507b46d3f2d62b31c794cd238d492acf960c95078cb1c945520debd5d2762103df7cef0fc36acfe9ff9a94549fc  update-u-boot"

main/u-boot/update-u-boot

@@ -108,7 +108,7 @@ wand)
 	;;
 cubie|cubie2)
 	[ -e "$imagedir/Cubieboard${board#cubie}" ] || die "Cubieboard images not installed, apk add u-boot-cubieboard"
-	$dryrun dd if=$imagedir/Cubieboard${board#cubie}/u-boot-sunxi-with-spl.bin of=/dev/sda bs=1024 seek=8 status=none
+	$dryrun dd if=$imagedir/Cubieboard${board#cubie}/u-boot-sunxi-with-spl.bin of=$device bs=1024 seek=8 status=none
 	;;
 mx6cuboxi)
 	[ -e "$imagedir/mx6cuboxi" ] || die "iMX6 Cubox-i images not installed, apk add u-boot-cuboxi"