AST2400: Set kernel preferred provider version

In preparation for supporting AST2500 with a different branch.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-kernel/linux/linux-obmc.inc b/common/recipes-kernel/linux/linux-obmc.inc
new file mode 100644
index 0000000..24db6f7
--- /dev/null
+++ b/common/recipes-kernel/linux/linux-obmc.inc
@@ -0,0 +1,27 @@
+DESCRIPTION = "Linux kernel for OpenBMC"
+SECTION = "kernel"
+LICENSE = "GPLv2"
+
+KCONFIG_MODE="--alldefconfig"
+
+KSRC ?= "git://github.com/openbmc/linux;protocol=git;branch=${KBRANCH}"
+SRC_URI = "${KSRC}"
+
+LINUX_VERSION_EXTENSION ?= "-${SRCREV}"
+
+PV = "${LINUX_VERSION}+git${SRCPV}"
+
+COMPATIBLE_MACHINE_${MACHINE} = "openbmc"
+
+do_patch_append() {
+        for DTB in "${KERNEL_DEVICETREE}"; do
+               DT=`basename ${DTB} .dtb`
+                if [ -r "${WORKDIR}/${DT}.dts" ]; then
+                        cp ${WORKDIR}/${DT}.dts \
+                                ${STAGING_KERNEL_DIR}/arch/${ARCH}/boot/dts
+               fi
+       done
+}
+
+inherit kernel
+require recipes-kernel/linux/linux-yocto.inc
diff --git a/common/recipes-kernel/linux/linux-obmc_4.4.bb b/common/recipes-kernel/linux/linux-obmc_4.4.bb
index 825a555..ef854a5 100644
--- a/common/recipes-kernel/linux/linux-obmc_4.4.bb
+++ b/common/recipes-kernel/linux/linux-obmc_4.4.bb
@@ -1,30 +1,5 @@
-DESCRIPTION = "Linux kernel for OpenBMC"
-SECTION = "kernel"
-LICENSE = "GPLv2"
-
 KBRANCH ?= "dev-4.4"
-KCONFIG_MODE="--alldefconfig"
-
-SRC_URI = "git://github.com/openbmc/linux;protocol=git;branch=${KBRANCH}"
-
 LINUX_VERSION ?= "4.4"
-LINUX_VERSION_EXTENSION ?= "-${SRCREV}"
-
 SRCREV="openbmc-20160606-1"
 
-PV = "${LINUX_VERSION}+git${SRCPV}"
-
-COMPATIBLE_MACHINE_${MACHINE} = "openbmc"
-
-inherit kernel
-require recipes-kernel/linux/linux-yocto.inc
-
-do_patch_append() {
-        for DTB in "${KERNEL_DEVICETREE}"; do
-               DT=`basename ${DTB} .dtb`
-                if [ -r "${WORKDIR}/${DT}.dts" ]; then
-                        cp ${WORKDIR}/${DT}.dts \
-                                ${STAGING_KERNEL_DIR}/arch/${ARCH}/boot/dts
-               fi
-       done
-}
+require linux-obmc.inc