Some firmware supports sending input events for shift and logo keys. Previously, we would suppress these with EFI_NOT_READY unless some other key was pressed alongside, but it is really the job of the caller to decide how to handle these. Note that for keys that already have a printable shift representation the reported input event will not have the shift key bits set (Shift+a is reported as A). Should some firmware turn out to violate the spec here we can always remove that part. (cherry picked from commit 3f9973bf368475d1f2f7f587e7af728dd6d84e10)
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