aspeed: Add Aspeed global configuration file

Create a common Aspeed layer configuration file to host pointers to
things like u-boot and kernel trees that support SOCs from Aspeed.

Tested: Built image and verified in witherspoon qemu
Change-Id: I9ad2720d8b4dff191e43be0b2c1514d25d7bf3ef
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/conf/machine/include/aspeed.inc b/conf/machine/include/aspeed.inc
new file mode 100644
index 0000000..06d868f
--- /dev/null
+++ b/conf/machine/include/aspeed.inc
@@ -0,0 +1,10 @@
+PREFERRED_PROVIDER_virtual/kernel ?= "linux-obmc"
+
+ASPEED_UBOOT_VERSION ?= "v2016.07+git%"
+
+PREFERRED_PROVIDER_virtual/kernel ?= "linux-obmc"
+PREFERRED_PROVIDER_virtual/bootloader ?= "u-boot"
+PREFERRED_VERSION_u-boot ?= "${ASPEED_UBOOT_VERSION}"
+PREFERRED_VERSION_u-boot-fw-utils ?= "${ASPEED_UBOOT_VERSION}"
+
+MACHINEOVERRIDES .= ":aspeed"