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

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>

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