efi_loader: implement OpenProtocolInformation
efi_open_protocol_information provides the agent and controller handles as well as the attributes and open count of an protocol on a handle. Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> [agraf: fix counting error] Signed-off-by: NAlexander Graf <agraf@suse.de>
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