main/linux-lts: version the mkinitfs depends for compressed modules support

The linux-lts and linux-virt kernels from 3.15.0 onwards use compressed
kernel modules. However support for this was only added to mkinitfs in
version 3.6.0.

Some users upgrading to the kernels in either Alpine Edge or 3.15 from
earlier versions have had "boot hangs" afterwards. At least some of
these problems appear to have occurred when "apk -aU upgrade" was not
run beforehand to ensure a suitable mkinitfs was installed. This change
adds an explicit minimum mkinitfs  version dependancy to resolve this
issue.

Fixes #13218.

main/linux-lts/APKBUILD

@@ -7,10 +7,10 @@ case $pkgver in
 	*.*.*)	_kernver=${pkgver%.*};;
 	*.*) _kernver=$pkgver;;
 esac
-pkgrel=0
+pkgrel=1
 pkgdesc="Linux lts kernel"
 url="https://www.kernel.org"
-depends="mkinitfs"
+depends="mkinitfs>=3.6.0"
 _depends_dev="perl gmp-dev mpc1-dev mpfr-dev elfutils-dev bash flex bison zstd"
 makedepends="$_depends_dev sed installkernel bc linux-headers linux-firmware-any openssl1.1-compat-dev mawk
 	diffutils findutils zstd"