Update vendor package to make it optional
This change is required to make the mali libraries optional when building android for the yukawa target. The PRODUCT_PACKAGE is moved from device-common.mk in the aosp tree to vendor.mk in the vendor package. The device-common.mk file will use this vendor.mk file to ship the mali libraries.
also adds a readme at the root of the repository.
Signed-off-by: Maxime Fournier mfournier@baylibre.com