x86/microcode: Get rid of the schedule work indirection

commit 2e199733 upstream

Scheduling work on all CPUs to collect the microcode information is just
another extra step for no value. Let the CPU hotplug callback registration
do it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231017211723.354748138@linutronix.de


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>