beaglebone: initial Kconfig and Makefiles

Initial structure of Beaglebone port

Change-Id: Ia255ab207f424dcd525990cdc0d74953e012c087
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3279
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/cpu/ti/Makefile.inc b/src/cpu/ti/Makefile.inc
new file mode 100644
index 0000000..64b22f6
--- /dev/null
+++ b/src/cpu/ti/Makefile.inc
@@ -0,0 +1 @@
+subdirs-$(CONFIG_CPU_TI_AM335X) += am335x