OvmfPkg/README: Update required QEMU & OS boot status

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13999 6f19259b-4bc3-4df7-8a09-765794883524
1 file changed