qemux86/xorg.conf: no DefaultDepth for VMware SVGA driver

VMware SVGA driver needs to have same depth between the host and the guest. Or put in
other word, the depth read by the guest is the value read from host. The guest is not
allowed to change virtual depth to other value. With DefaultDepth option xorg.conf,
vmware driver rejects to work with suggestion "Please do not specify a depth on the
command line or via the config file".

Signed-off-by Kevin Tian <kevin.tian@intel.com>

meta/packages/xorg-xserver/xserver-xf86-config/qemux86/xorg.conf

@@ -53,7 +53,6 @@ Section "Screen"
     Identifier    "Default Screen"
     Device        "Graphics Controller"
     Monitor        "Generic Monitor"
-    DefaultDepth    24
     SubSectionSub "Display"
         Modes     "640x480"
     EndSubSection

meta/packages/xorg-xserver/xserver-xf86-config_0.1.bb

@@ -2,7 +2,7 @@ DESCRIPTION = "X.Org X server configuration file"
 HOMEPAGE = "http://www.x.org"
 SECTION = "x11/base"
 LICENSE = "MIT-X"
-PR = "r7"
+PR = "r8"
 
 SRC_URI = "file://xorg.conf"