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Add gpio initializaiton and gpio usage implementation
gpio usage:
-s <slot>,virtio-gpio,<gpio resources>
<gpio resources format>
<@chip_name{offset|name[=vname]:offset|name[=vname]:...}
[@chip_name{offset|name[=vname]:offset|name[=vname]:...}]
[@chip_name{offset|name[=vname]:offset|name[=vname]:...}]
...>
Tracked-On: #2512
Signed-off-by: Yuan Liu <yuan1.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>