x86/APIC: restrict certain messages to BSP

x86/APIC: restrict certain messages to BSP

All CPUs get an equal setting of EOI broadcast suppression; no need to
log one message per CPU, even if it's only in verbose APIC mode.

Only the BSP is eligible to possibly get ExtINT enabled; no need to log
that it gets disabled on all APs, even if - again - it's only in verbose
APIC mode.

Take the opportunity and introduce a "bsp" parameter to the function, to
stop using smp_processor_id() to tell BSP from APs. No functional change
from this.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>