qemu: fix compile error

Backport 2 patches and rebase
0001-hw-display-qxl-Pass-requested-buffer-size-to-qxl_phy.patch to fix
compile error:

../qemu-6.2.0/hw/display/qxl.c: In function 'qxl_phys2virt':
../qemu-6.2.0/hw/display/qxl.c:1477:67: error: 'size' undeclared (first use in this function); did you mean 'gsize'?
 1477 |         if (!qxl_get_check_slot_offset(qxl, pqxl, &slot, &offset, size)) {
      |                                                                   ^~~~
      |                                                                   gsize
../qemu-6.2.0/hw/display/qxl.c:1477:67: note: each undeclared identifier is reported only once for each function it appears in

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>