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kernel: make mp mode and msi interrupts the default. *msi -> *nomsi

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -693,12 +693,8 @@

 processors.

 .SS \fL*apicdebug=\fP

 Prints a summary of the multiprocessor APIC interrupt configuration.

-.SS \fL*msi=\fP

-Enables message signaled interrupts on devices that support it (see

-.IR icanhasmsi (8)).

-It is mutually exclusive with the

-.B *nomp=

-option.

+.SS \fL*nomsi=\fP

+Disables message signaled interrupts.

 .SS \fL*pcimaxbno=value\fP

 This puts a limit on the maximum bus number probed

 on a PCI bus (default 7).

--- a/sys/src/9/pc/mp.c

+++ b/sys/src/9/pc/mp.c

@@ -579,7 +579,7 @@

 	int tbdf, vno, cap, cpu, ok64;

 	Pcidev *pci;

-	if(getconf("*msi") == nil)

+	if(getconf("*nomsi") != nil)

 		return -1;

 	tbdf = v->tbdf;

 	if(tbdf == BUSUNKNOWN || BUSTYPE(tbdf) != BusPCI)