meta-yocto: make 3.4 the default kernel for qemu*

The 3.4 kernel is available and has been built and booted on
all the qemu machines, so it now becomes the default for the
qemu machines, and machines that don't explicitly set a preferred
version.

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

meta-yocto/conf/distro/poky.conf

@@ -12,12 +12,12 @@ LOCALCONF_VERSION = "1"
 
 DISTRO_FEATURES_append = " largefile opengl"
 
-PREFERRED_VERSION_linux-yocto ?= "3.0%"
-PREFERRED_VERSION_linux-yocto_qemux86 ?= "3.2%"
-PREFERRED_VERSION_linux-yocto_qemux86-64 ?= "3.2%"
-PREFERRED_VERSION_linux-yocto_qemuarm ?= "3.2%"
-PREFERRED_VERSION_linux-yocto_qemumips ?= "3.2%"
-PREFERRED_VERSION_linux-yocto_qemuppc ?= "3.2%"
+PREFERRED_VERSION_linux-yocto ?= "3.4%"
+PREFERRED_VERSION_linux-yocto_qemux86 ?= "3.4%"
+PREFERRED_VERSION_linux-yocto_qemux86-64 ?= "3.4%"
+PREFERRED_VERSION_linux-yocto_qemuarm ?= "3.4%"
+PREFERRED_VERSION_linux-yocto_qemumips ?= "3.4%"
+PREFERRED_VERSION_linux-yocto_qemuppc ?= "3.4%"
 
 SDK_NAME = "${DISTRO}-${TCLIBC}-${SDK_ARCH}-${TARGET_ARCH}"
 SDKPATH = "/opt/${DISTRO}/${SDK_VERSION}"