Print the correct register for the arm64 elr

In 7ec86b6609912 ("Also print symbols when printing arm64 registers")
a new function was created to print most registers. Unfortunately the
Link Register (LR) was being printed when we should have printed the
Exception Link Register (ELR).

Fix this by adding the missing 'e'.

Sponsored by: The FreeBSD Foundation

(cherry picked from commit 62cbc00d2f57785c747632b1a5ba7571281d17c4)