qemu: Move recipe version specific patches and features to recipe
Move all the version specific patches, overrides and configuration that
are in qemu.inc to the versioned QEMU recipe.
This includes moving patches that target the versioned recipe, ptest
configuration (which is not available in QEMU by default) and the
installing of the powerpc_rom.bin. All these patches/files are also
only located in the FILESEXTRAPATHS that is valid from the recipe file
and not from qemu.inc itself.
The purpose of this change is to make the qemu.inc re-usable for
multiple versions of QEMU as well as forks and recipes that intend to
provide custom patches.
