Refactor kernel recipes to reduce code duplication

From: Philipp Wagner <mail@philipp-wagner.com>

Change-Id: Ie4bc0d5f3f3301a1955dd077a0d2c3e3286266e3
Signed-off-by: Philipp Wagner <mail@philipp-wagner.com>
Signed-off-by: Alexandru Niculita <alexnick87@gmail.com>

recipes-kernel/linux/linux-raspberrypi.inc

@@ -0,0 +1,34 @@
+require linux.inc
+
+DESCRIPTION = "Linux Kernel for Raspberry Pi"
+SECTION = "kernel"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
+
+COMPATIBLE_MACHINE = "raspberrypi"
+
+PV_append = "+git${SRCREV}"
+
+S = "${WORKDIR}/git"
+
+# NOTE: For now we pull in the default config from the RPi kernel GIT tree.
+KERNEL_DEFCONFIG = "bcmrpi_defconfig"
+
+# CMDLINE for raspberrypi
+CMDLINE_raspberrypi = "dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait"
+
+UDEV_GE_141 ?= "1"
+
+do_configure_prepend() {
+    install -m 0644 ${S}/arch/${ARCH}/configs/${KERNEL_DEFCONFIG} ${WORKDIR}/defconfig || die "No default configuration for ${MACHINE} / ${KERNEL_DEFCONFIG} available."
+}
+
+do_install_prepend() {
+    install -d ${D}/lib/firmware
+}
+
+do_deploy_append() {
+    # Deploy cmdline.txt
+    install -d ${DEPLOYDIR}/bcm2835-bootfiles
+    echo "${CMDLINE}" > ${DEPLOYDIR}/bcm2835-bootfiles/cmdline.txt
+}