Previously we added the header in the kernel packages but as we already
add the ramdisk header here and to simplify the process we also add the
addition of the kernel header into mkinitfs.
Read kernel module names from files in
/etc/postmarketos-mkinitfs/modules and print out which modules are
required by which of these files as the initramfs gets generated. Put
the default modules into a new 00-default.modules. This allows mkinitfs
hooks to add modules to the initramfs.
Parse the modules from a file similar to modules-load.d, with commented
lines and empty lines ignored. Add a simple test script for that and run
it in check().
Split mkinitfs.sh into two files, so the functions (now in
mkinitfs_functions.sh) can be sourced in a test. Such a test will be
added in the next commit.
Move $BINARIES_EXTRA into the get_binaries_extra() function, so its
$(find...) does not get executed when sourcing the functions file. Move
$BINARIES into get_binaries() too for consistency.
