package/qemu: remove uneeded upstream patches

Although those patches were properly dropped when the origianl bump was
applied to the next branch (commit 4675c7d4), both net and master also
had a commit that moved the patches around when the csku fork was
removed (commit 58af9a70 and 20f45029, respectively).

This seemed to have caused some confusion with git-merge, though, and
the y re-appeared after the merge.

Remove them again for good, this time.

Fixes: http://autobuild.buildroot.net/results/0adfb031c243709b0bac71599ed419b64cc514a4



Signed-off-by: Adam Duskett <Aduskett@gmail.com>
[yann.morin.1998@free.fr:
  - rewrite commit log to explain why the patches reappeared
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>