Minor updates to sysutils/cpupdate:

• fix typo in cpupdate_ibrs_enable previously named cpupdate_irbs_enable;
• catch up with upstream README.md update that does not state anymore that it is work in progress but mention it is for Intel only still;
• catch up with platomav/CPUMicrocodes MCE DB r65 update for completeness despite it has only AMD updates comparing previous r64;
• update pkg-message with note that suspend/resume sequence clears microcode update;
• add new keyword "resume" to startup script to ease its invocation on resume by means of rcorder(8).

PR: 227866
Reported by: Michael Danilov <mike.d.ft402@gmail.com>