poky: Remove machine specific kernel overrides

This patch removes the machine specific overrides in poky.conf for all
the qemu machines.  With this patch, if you set
PREFERRED_VERSION_linux-yocto="X%" then all the qemu machines as well as
the sample hardware boards will use that version. Without this patch,
the hardware boards would have used version X but the qemu machines
would have needed to have a PREFERRED_VERSION_linux-yocto_qemuarm="X%"
for qemuarm to use that version, for example.  If we need to force a
specific machine (hardware or qemu) to a particular default version we
should add it to the machine conf files for that machine, not in the
distro conf.

(From meta-yocto rev: 6b194a137dcedcae7e4b03f9ebed822d44f53fe2)

Signed-off-by: brian avery <brian.avery@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/distro/poky.conf

@@ -22,12 +22,6 @@ POKY_DEFAULT_EXTRA_RRECOMMENDS = "kernel-module-af-packet"
 DISTRO_FEATURES ?= "${DISTRO_FEATURES_DEFAULT} ${DISTRO_FEATURES_LIBC} ${POKY_DEFAULT_DISTRO_FEATURES}"
 
 PREFERRED_VERSION_linux-yocto ?= "4.10%"
-PREFERRED_VERSION_linux-yocto_qemux86 ?= "4.10%"
-PREFERRED_VERSION_linux-yocto_qemux86-64 ?= "4.10%"
-PREFERRED_VERSION_linux-yocto_qemuarm ?= "4.10%"
-PREFERRED_VERSION_linux-yocto_qemumips ?= "4.10%"
-PREFERRED_VERSION_linux-yocto_qemumips64 ?= "4.10%"
-PREFERRED_VERSION_linux-yocto_qemuppc ?= "4.10%"
 
 SDK_NAME = "${DISTRO}-${TCLIBC}-${SDK_ARCH}-${IMAGE_BASENAME}-${TUNE_PKGARCH}"
 SDKPATH = "/opt/${DISTRO}/${SDK_VERSION}"
@@ -84,9 +78,9 @@ SANITY_TESTED_DISTROS ?= " \
             opensuse-42.2 \n \
             "
 #
-# OELAYOUT_ABI allows us to notify users when the format of TMPDIR changes in 
+# OELAYOUT_ABI allows us to notify users when the format of TMPDIR changes in
 # an incompatible way. Such changes should usually be detailed in the commit
-# that breaks the format and have been previously discussed on the mailing list 
+# that breaks the format and have been previously discussed on the mailing list
 # with general agreement from the core team.
 #
 OELAYOUT_ABI = "12"