QEMU doesn't support MTRR emulation in some cases, and therefore the MtrrLib calls may return an error. In that case, we should silently ignore the error. Signed-off-by: jljusten git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12618 6f19259b-4bc3-4df7-8a09-765794883524