arm.risu: Add pattern for Neon "1 reg + modified immediate" forms
arm.risu: Add pattern for Neon "1 reg + modified immediate" forms

vivier/risu,hw-claudio/risu-aarch64,vivier/risu,hw-claudio/risu-aarch64,stsquad/risu,stsquad/risu,stsquad/risu