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.

(From meta-phosphor rev: c9cf073a884e3f13622e986b74eb6c295f119d00)

Change-Id: Idd40ba2fdaa79b004b44c043e99373ca3397131c
Signed-off-by: Samuel Jiang <chyishian.jiang@gmail.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend b/meta-phosphor/raspberrypi/recipes-kernel/linux/linux-raspberrypi_%.bbappend
new file mode 100644
index 0000000..71e208c
--- /dev/null
+++ b/meta-phosphor/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"