skiboot: Move skiboot from buildroot tree into openpower overlay

This change moves the skiboot package from the buildroot tree, into the
op-build tree (ie, into the openpower BR2 overlay).

This will allow us to decouple buildroot updates from skiboot updates.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/openpower/package/skiboot/Config.in b/openpower/package/skiboot/Config.in
new file mode 100644
index 0000000..e1f571d
--- /dev/null
+++ b/openpower/package/skiboot/Config.in
@@ -0,0 +1,15 @@
+
+config BR2_TARGET_SKIBOOT
+	bool "skiboot"
+	depends on BR2_powerpc64 || BR2_powerpc64le
+        default y if (BR2_OPENPOWER_PLATFORM && BR2_powerpc_power8)
+	help
+	  Build skiboot POWER8 firmware
+
+if BR2_TARGET_SKIBOOT
+
+config BR2_TARGET_SKIBOOT_EMBED_PAYLOAD
+	bool "Embed kernel payload in skiboot image"
+	depends on BR2_LINUX_KERNEL_ZIMAGE_EPAPR
+
+endif