Update SeaBIOS to 0.5.1

 - 5da6833 Update version to 0.5.1
 - 669c991 Fix sign error preventing incorrect memory over 4gig calculation.
 - 7e6bd3e Minor - better indent assembler in int1587.
 - 48cf232 Add comment explaining why mptable is in low memory.
 - 643062f Add int1589 support.
 - 085debd Set FDPT in irq table even for small drives.
 - 7c1b186 Reduce #ifs by weeding out some cross-chunk function definitions.
 - f9b25d3 Fix vgahook sign issue; add warning to build to catch future cases.
 - 3862b2d vgabios: Fix compile error due to fixed prototypes.
 - 1ca05b0 Be sure to add "void" to all function prototypes that take no args.
 - b5bb9db mptable: Reset pinmask on new bus or device.
 - 8918989 Detect latest FC12 gcc -combine breakage.
 - c9d3c2d Minor vga binary cleanups.
 - 9a8609f Make MTRR region 0xc0000-0x100000 be cached.
 - fdca418 Force a link error if a function is used from the wrong code chunk.
 - dad41d9 Add __noreturn define for __attribute__((noreturn)).
 - c003148 Implement native 32bit APM support.
 - 5c99b6c Commit compiled dsdt file; misc comment updates.
 - 29f4b91 prevent acpi from rerouting SCI interrupt
 - 4c94b7e enumerate all PCI buses in mptable
 - 871e0a0 Add support for 32bit PCI BIOS entry.
 - eda2c83 Only add "addr32" to memory accesses that require them.
 - 52a300f Introduce MODESEGMENT define; rename VISIBLE32 to VISIBLE32FLAT.
 - fe2c3ee Allocate smbios in temp space and copy into final location.
 - b164d2c Clear user reserved interrupts (0x60-0x66).
 - d9104ff Remove pci_bios_bigmem_addr; set pci_bios_mem_addr=0xe0000000
 - 14021f2 Add initial support for ATA DMA.
 - 8362699 Allocate mptable in temp space and copy into final location.
 - 979862e Also report memory over 4G during init.
 - 928d4df provide correct pci routing information in mptable
 - afc02da Add symbolic definitions for MTRR code.
 - fb214dc Fix yield() so it works from boot code.
 - 2ceeec9 Fix potential build failure due to text16 section being too large.
 - a2195e4 Increase version in preparation for next release.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/pc-bios/bios.bin b/pc-bios/bios.bin
index 827327d..1741eec 100644
--- a/pc-bios/bios.bin
+++ b/pc-bios/bios.bin
Binary files differ
diff --git a/roms/seabios b/roms/seabios
index 494302f..5da6833 160000
--- a/roms/seabios
+++ b/roms/seabios
@@ -1 +1 @@
-Subproject commit 494302fe196f7016d56814f0adc83ba1d54c0518
+Subproject commit 5da68339ecf44677b8f4f115cdf3cb1da46a9f6c