Update SeaBIOS

Update SeaBIOS

 - 7d09d0e Fix virtio compile errors on various gcc versions.
 - 89acfa3 Support for booting from virtio disks
 - 6d66316 smbios: avoid counting io hole as ram
 - e5cd945 Fix error causing USB HID "boot" protocol to not be enabled.
 - 0e88576 Add support for USB mice.
 - dd5a8a6 When USB keyboard active, don't send keyboard commands to ps2 port.
 - 5718d56 Document usb-hid.c functions.
 - e438b0c Further parallelize init when using CONFIG_THREAD_OPTIONROMS.
 - f59b5ac Handle unknown function addresses in tools/checkstack.py.
 - 9ba1dea Simplify build by manually resolving external symbols in layoutrom.py.
 - 698d3f9 USB EHCI should yield() whil waiting for controller to ack reset.
 - f9a774c Add __attribute__((__malloc__)) declaration to internal malloc funcs.
 - b7045ce Minor - remove redundant check from ata_try_dma.
 - 67f6d37 Fix possible unitialized variable issue in usb msc.
 - a7eb8fc Some improvements to optionrom preemption support.
 - d28b0fe Refactor USB hub code.
 - ba28541 Prep version for next release.
 - 12bffd5 Update version to 0.6.0.
 - 87ab2fb Improve USB EHCI timing.
 - d705e5a Disable inlining on old compilers.
 - bca0736 Force use of indirect function calls in inline assembler.
 - d7eb27e Don't move EBDA while an optionrom is running (CONFIG_THREAD_OPTIONROMS).
 - 7415270 Call to int1552 (from int1346) should set regs->dl.
 - 9dc243e Adjust debug levels of device discovery.
 - d9c9361 Default CONFIG_COREBOOT_FLASH on; make depend on CONFIG_COREBOOT.
 - c35e1e5 Restore segment limits in handle_1589 code.
 - 11cc662 Extend time for rtc to be ready.
 - 4ed378a Backup and restore registers when calling out to user funcs.
 - 68c5139 Enable irqs in kbd/clock calls that caller might "spin" on.
 - f628244 Process event on ps2 keyboard irq even if event already read.
 - a5d8458 Revert "Unify ps2 port data processing."
 - b9ed5e2 Handle variable length return of ps2 port GETID command.
 - 67a9eec Prevent ps2 irqs from messing up ps2 init.
 - 6704cf9 Revert "Rework disabling of ps2 port irqs."
 - 808939c Fix smp cpu detect on gcc 4.5.
 - a979c1c Improvements to tools/checkstack.py.
 - 190cc62 Add USB EHCI controller support.
 - 0770d67 Some USB UHCI and OHCI fixes and cleanups.
 - bfe7ca7 Minor - USB OHCI interrupt queue should be one larger.
 - 09e2f7c Reduce size of USB 'struct uhci_td'.
 - 406fad6 Dynamically allocate USB controller structures.
 - 4547eb9 Replace USB encoded 'u32 endp' scheme with explicit struct fields.
 - 8ebcac0 Further parallelize USB init by launching a thread per usb port.
 - e908665 Introduce simple "mutex" locking code.
 - 3b79f8b Only compile usb-hub.c and paravirt.c with 32bit code.
 - 357bdfa Prefer passing a USB "pipe" structure over a USB endp encoding.
 - 7fb8ba8 Add a generic "internal error" warning function.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>