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f7939a8081
Add Rpmsg-Port-SPI transport layer. Rpmsg Port SPI is a new rpmsg transport layer based on the Rpmsg Port, it provides the capability for two SPI-connected (and two extra GPIO) chips to communicate with each other using Rpmsg. All already implemented Rpmsg Services can be used with this new transport layer without any modifications. Signed-off-by: liaoao <liaoao@xiaomi.com>