libpayload: initial test case + tiny "framework"

This adds a test case for using CBFS images that reside in RAM
and a Makefile to run it (and maybe other tests in the future).

The test concerns an issue in libcbfs when using x86 style CBFS
images in non-canonical locations (eg. when loading CBFS images
for processing).

Use with "make run" inside the tests directory.

Change-Id: I1af3792a1451728ff9594ba7f0410027cdecb59d
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/2623
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

payloads/libpayload/tests/libpayload-config.h

@@ -0,0 +1,30 @@
+/*
+ * Automatically generated C config: don't edit
+ * libpayload version: 0.2.0
+ * Sat Mar  9 10:22:45 2013
+ */
+#define AUTOCONF_INCLUDED
+#define CONFIG_SPEAKER 1
+#define CONFIG_STORAGE 1
+#define CONFIG_LIBC 1
+#define CONFIG_CBFS 1
+#define CONFIG_VGA_VIDEO_CONSOLE 1
+#define CONFIG_SERIAL_CONSOLE 1
+#define CONFIG_PC_KEYBOARD 1
+#define CONFIG_ARCH_X86 1
+#define CONFIG_STORAGE_ATA 1
+#define CONFIG_ARCH_SPECIFIC_OPTIONS 1
+#define CONFIG_STORAGE_AHCI_ONLY_TESTED 1
+#define CONFIG_X86_SERIAL_CONSOLE 1
+#define CONFIG_PDCURSES 1
+#define CONFIG_NVRAM 1
+#define CONFIG_PC_KEYBOARD_LAYOUT_US 1
+#define CONFIG_STORAGE_AHCI 1
+#define CONFIG_MULTIBOOT 1
+#define CONFIG_SERIAL_IOBASE 0x3f8
+#define CONFIG_CURSES 1
+#define CONFIG_CBMEM_CONSOLE 1
+#define CONFIG_LITTLE_ENDIAN 1
+#define CONFIG_PCI 1
+#define CONFIG_STORAGE_ATAPI 1
+#define CONFIG_VIDEO_CONSOLE 1