Config.mk: update OVMF changeset

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

(cherry picked from commits 04c5efb0a1
 and f046e501bb)

Apropos of discussion in
 "OVMF related osstest failures on multiple branches"
 http://lists.xenproject.org/archives/html/xen-devel/2016-01/msg00442.html

We believe the older ovmf.git does not work when built with the gcc in
Debian jessie.  We do not know where this bug lies but we are fixing
it by updating ovmf.

We have decided that we are not in a position to review the changes to
OVMF upstream, and ourselves decide what to cherry pick.  Instead we
will update the revision wholesale and use the xen.git stable
branches' push gate.

Conflicts:
	Config.mk

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

(cherry picked from commits 6c3c6ff9ec
 and 1d3cc6e62c)

Conflicts:
	Config.mk
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
(cherry picked from commit ee576d7110)

Conflicts:
	Config.mk
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
(cherry picked from commit 6d2c41d676)

In 4.3, old OVMF_UPSTREAM_REVISION was b0855f92 rather than cb9a7eba.
I have pulled in the additional changes, willy-nilly.

Conflicts:
	Config.mk
Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

Config.mk

@@ -211,7 +211,7 @@ OVMF_UPSTREAM_URL ?= git://xenbits.xen.org/ovmf.git
 QEMU_UPSTREAM_URL ?= git://xenbits.xen.org/qemu-xen.git
 SEABIOS_UPSTREAM_URL ?= git://xenbits.xen.org/seabios.git
 endif
-OVMF_UPSTREAM_REVISION ?= b0855f925c6e2e0b21fbb03fab4b5fb5b6876871
+OVMF_UPSTREAM_REVISION ?= 52a99493cce88a9d4ec8a02d7f1bd1a1001ce60d
 QEMU_UPSTREAM_REVISION ?= qemu-xen-4.3.4
 SEABIOS_UPSTREAM_TAG ?= 3a28511b46f0c2af5fae1b6ed2b0c19d7913cee3
 # Wed Jun 26 16:30:45 2013 +0100