linux-raspberrypi: fix do_configure failure

When building against newer yocto project releases below failure
occurs.

| DEBUG: Executing shell function do_configure
| NOTE: make oldconfig
| make: *** No rule to make target `oldconfig'.  Stop.
| ERROR: oe_runmake failed
| WARNING: exit code 1 from a shell command.
| ERROR: Function failed: do_configure

Fix this by trying to adapt more of the standard mechanism
that exists in yocto, in order to build "custom kernels".

Change-Id: I0598c0c16d84295a454976f60b56f9d35c36a4ba
Signed-off-by: Petter Mabäcker <petter@technux.se>
Acked-by: Andrei Gherzan <andrei@gherzan.ro>

recipes-kernel/linux/linux-raspberrypi.inc

@@ -5,12 +5,14 @@ SECTION = "kernel"
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"
 
+SRC_URI += " \
+        file://defconfig \
+        "
+
 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"
 
@@ -19,7 +21,7 @@ CMDLINE_raspberrypi = "dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA
 
 UDEV_GE_141 ?= "1"
 
-do_configure_prepend() {
+do_kernel_configme_prepend() {
     install -m 0644 ${S}/arch/${ARCH}/configs/${KERNEL_DEFCONFIG} ${WORKDIR}/defconfig || die "No default configuration for ${MACHINE} / ${KERNEL_DEFCONFIG} available."
 }