RRC: fix ASN.1 description by manually adding CR5591

Without it, dual-band DF-3C feature does not work

Change-Id: I95d4a7320b77c6093f5d51efdbb2b21af0deab11
Reviewed-on: https://code.wireshark.org/review/2942
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>