linux-postmarketos-lts: replace linux-lts

fixes:

> ERROR: linux-postmarketos-lts-6.12.67-r0: trying to overwrite usr/share/kernel/lts/kernel.release owned by linux-lts-6.12.28-r0.

Signed-off-by: Clayton Craft <craftyguy@postmarketos.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7861>

device/main/linux-postmarketos-lts/APKBUILD

@@ -2,7 +2,7 @@
 maintainer="Aelin <aelin@postmarketos.org>"
 pkgname=linux-postmarketos-lts
 pkgver=6.12.67
-pkgrel=0
+pkgrel=1
 _kver=${pkgver%.*}
 pkgdesc="LTS Kernel"
 # armhf: pmbootstrap cannot dynamically choose a defconfig, so it ends up using multi_v7_defconfig which isn't correct
@@ -48,6 +48,7 @@ makedepends="
 	sed
 	zstd
 "
+replaces="linux-lts"
 
 # Source
 source="