meta-facebook: yosemite4: Initial commit for yosemite4n

Description:
Add yosemite4n layer under yosemite4.
Add common configurations for yosemite4 and yosemite4n.
Add json file set uboot baudrate to 57600.

Tested:
Build Success.

Change-Id: I7ff2ffa3e008be9d2f132ac6c3f058fa7b33f329
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
Signed-off-by: Tim Lee <timlee660101@gmail.com>
Signed-off-by: Ricky CX Wu <ricky.cx.wu.wiwynn@gmail.com>
diff --git a/meta-facebook/meta-yosemite4/recipes-bsp/u-boot/u-boot-aspeed-sdk_%.bbappend b/meta-facebook/meta-yosemite4/recipes-bsp/u-boot/u-boot-aspeed-sdk_%.bbappend
index a35fc42..8f468ce 100644
--- a/meta-facebook/meta-yosemite4/recipes-bsp/u-boot/u-boot-aspeed-sdk_%.bbappend
+++ b/meta-facebook/meta-yosemite4/recipes-bsp/u-boot/u-boot-aspeed-sdk_%.bbappend
@@ -1,2 +1,2 @@
-FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:"
-SRC_URI +="file://yosemite4.cfg"
+FILESEXTRAPATHS:prepend := "${THISDIR}/${PN}:${THISDIR}/../../../recipes-bsp/uboot/files:"
+SRC_URI +="file://yosemite4-common.cfg"