xserver-xf86-config: add a configuration fragment to disable screen blanking

Add a configuration fragment that disables screen blanking, and add it
to all qemu machines.

(From OE-Core rev: 72855767daa515a451ea7ebe3412479cb7bafdc6)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 780a5ccaa51d5aed18200883a686387e70847e4b)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta/recipes-graphics/xorg-xserver/xserver-xf86-config/qemuall/noblank.conf

@@ -0,0 +1,7 @@
+# Disable screen blanking
+Section "ServerFlags"
+    Option        "BlankTime" "0"
+    Option        "StandbyTime" "0"
+    Option        "SuspendTime" "0"
+    Option        "OffTime" "0"
+EndSection

meta/recipes-graphics/xorg-xserver/xserver-xf86-config_0.1.bb

@@ -5,6 +5,7 @@ LICENSE = "MIT"
 LIC_FILES_CHKSUM = "file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
 
 SRC_URI = "file://xorg.conf"
+SRC_URI:append:qemuall = " file://noblank.conf"
 
 S = "${WORKDIR}/sources"
 UNPACKDIR = "${S}"
@@ -19,4 +20,9 @@ do_install () {
 		install -d ${D}/${sysconfdir}/X11
 		install -m 0644 ${S}/xorg.conf ${D}/${sysconfdir}/X11/
 	fi
+
+	if test -s ${S}/noblank.conf; then
+		install -d ${D}/${sysconfdir}/X11/xorg.conf.d
+		install -m 0644 ${S}/noblank.conf ${D}/${sysconfdir}/X11/xorg.conf.d/
+	fi
 }