rpi3: Add a bootplan for raspberry pi 3.

The guts of the bootplan will be filled in later.

Change-Id: I15d2a00a179ed6a987868da3fc0297bc108914d7
diff --git a/src/image/Kconfig b/src/image/Kconfig
index f00fb06..5737b05 100644
--- a/src/image/Kconfig
+++ b/src/image/Kconfig
@@ -89,6 +89,9 @@
 config BOOTPLAN_QEMU_X86
 	bool "Basic x86 image suitable for booting on QEMU."
 
+config BOOTPLAN_RPI3
+	bool "Image for booting on the Raspberry Pi 3"
+
 config BOOTPLAN_UEFI
 	bool "Chain load from a UEFI based firmware."
 
@@ -111,6 +114,10 @@
 	string "Model name for this board"
 	depends on BOOTPLAN_FSP
 
+config BOOTPLAN_RPI3_MODEL
+	string "Model name for this board"
+	depends on BOOTPLAN_RPI3
+
 config BOOTPLAN_UEFI_MODEL
 	string "Model name for this board"
 	depends on BOOTPLAN_UEFI