Ouya: blacklist boot partition to avoid brick

Thanks to Robert Yang's pmbootstrap patch, we can now avoid flashing anything to the boot partition of the Ouya. With this patch, the latest pmbootstrap will refuse to do so with:

ERROR: 'boot' partition is blacklisted from being flashed! See the Ouya device wiki page for more information.

device/device-ouya-ouya/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=device-ouya-ouya
 pkgver=1
 pkgdesc="Ouya"
-pkgrel=6
+pkgrel=7
 url="https://postmarketos.org"
 arch="armhf"
 license="MIT"
@@ -22,6 +22,6 @@ package() {
 		"$pkgdir/etc/fb.modes"
 }
 
-sha512sums="6f9a28152072c52f73e9e483e3d724b26907dfaa82eec09d4b418278fa8d3d9433e391ed0684603c06a4cdccb47e6ac7a84dc9d8d171df5e77681855c374e5c2  deviceinfo
+sha512sums="185dab882c88066205f19310ffc5174cc1195becb3be84caf98f71892891e686b15f277336620e2f129894c79abdaba3a4f2c8712bf177ae685e79e74ec60182  deviceinfo
 c7253d5d6f53b7acbb1c2358e95ecba86ccbaa2bb5e99ad8db9f59e453209ddad55b13d8c1dc67f634cc4f997283b4079fa1b5b60f6d1440b13f39e5b1646d81  initfs-hook.sh
 bf442fac4dc0594e055ed7a7d8232b5c884e2e77543273e8c4f32b5fe3c199561c86d8a5f665e17406057ca7863fabb93e789fe5e168fcd89d2982e0046232ad  fb.modes"