meta-phosphor: add raspberrypi folder: add linux-kernel gpio-key patch

Add raspberrypi folder in meta-phosphor match phosphor related
package.

Add phosphor-gpio-keys cfg for build phosphor related kernel.

Change-Id: Ia3964629abc2d8f83d20d227f901a63f15927372
Signed-off-by: Samuel Jiang <chyishian.jiang@gmail.com>
diff --git a/raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend b/raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend
new file mode 100644
index 0000000..71e208c
--- /dev/null
+++ b/raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend
@@ -0,0 +1,4 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "file://phosphor-gpio-keys.scc"
+SRC_URI += "file://phosphor-gpio-keys.cfg"