device-nokia-n900: explicitly choose msdos partitioning scheme

u-boot on the Nokia N900 cannot boot from GPT, which will soon be the default scheme. Hence choose msdos explicitly.

device/community/device-nokia-n900/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Sicelo <absicsz@gmail.com>
 # Co-Maintainer: Danct12 <danct12@disroot.org>
 pkgname=device-nokia-n900
-pkgver=29
+pkgver=30
 pkgrel=0
 pkgdesc="Nokia N900"
 url="https://postmarketos.org"
@@ -215,7 +215,7 @@ ff51909873160c2d4c6f0c0119b6d4a02751df29f571b8596b4bc8b04ce2541913c11a583b0e5dab
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+40aaeb44941a988ab8ec58d331bc6cd42c4a23c6b6e8fc302f9216a38b46baab38d0a0137606a5b7959a51326983c03d684615c5ba9c58b0e36314ec8c49cfbb  deviceinfo
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 506accabcf9fb3e2a270228ea53fdcb57f51092d6e7126a631af8eed697cd882cc805b19cf255422284bec12c928b58219d173a4a790d784db5335a059b6bb4f  i3wm.conf