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aux/acpi: no need to require the embedded controller.

acpi does not require the machine to have an embedded controller,
stop requiring it to allow using aux/acpi for shutdown on machines
without one.

tested on my dell r520.

--- a/sys/src/cmd/aux/acpi.c

+++ b/sys/src/cmd/aux/acpi.c

@@ -459,8 +459,7 @@

 	}ARGEND

 	if((ec = open("/dev/ec", ORDWR)) < 0)

-		if((ec = open("#P/ec", ORDWR)) < 0)

-			goto fail;

+		ec = open("#P/ec", ORDWR);

 	if((mem = open("/dev/acpimem", ORDWR)) < 0)

 		mem = open("#P/acpimem", ORDWR);

 	if((iofd[1] = open("/dev/iob", ORDWR)) < 0)

@@ -618,8 +617,8 @@

 {

 	switch(io->space){

 	case EbctlSpace:

-		io->read = readec;

-		io->write = writeec;

+		io->read = ec >= 0 ? readec : dummy;

+		io->write = ec >= 0 ? writeec : dummy;

 		break;

 	case IoSpace:

 		io->read = readio;