acpi: eviscerate the old ACPI driver

It was a thing of beauty, but its beauty could not save it against the
onslaught of ACPI 5.0, now with vendor splash spages. Sorry.

We leave just enough of it there to provide a container for acpica.

Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>

sys/src/9/amd64/physalloc.c

@@ -482,7 +482,7 @@ physinit(uintmem a, uint64_t size)
 
 	for(addr = a; addr < a+size; addr += len){
 		dom = 0;
-		len = acpimblocksize(addr, &dom);
+		len = 0; // acpimblocksize(addr, &dom);
 		/* len can be zero if there's no acpi information about addr */
 		if(len == 0 || addr + len > a + size)
 			len = a + size - addr;