meta-nuvoton: Add build wic image support

We add wks file and relative config for build wic image. Now user can
build wic image by include phosphor-mmc.inc. And set WKS_RWFS_SIZE,
WKS_RWFS_SIZE to a

meta-nuvoton: Add build wic image support

We add wks file and relative config for build wic image. Now user can
build wic image by include phosphor-mmc.inc. And set WKS_RWFS_SIZE,
WKS_RWFS_SIZE to adjust eMMC parition size instead of create new wks
file for each board.

Change-Id: I1ed342658d791fd9011bd31ea6db36d4362d120b
Signed-off-by: Brian Ma <chma0@nuvoton.com>

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