keucr: remove some unneccesary typedefs

resolves checkpatch.pl warning "do not add new typedefs" and renames allcaps
structures.

Signed-off-by: Laura Lawniczak <laura.lawniczak@googlemail.com>
Signed-off-by: Johannes Schilling <of82ecuq@cip.cs.fau.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>