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pc64: increase sizes of physical memory bank maps

number of bank slots in Conf.mem[4] was too small
for kenjis machine, set it to maximum 16 (the
size of the RAM map in pc64/memory.c).

also increasing the UPA memory map to 64. the
e820 map on my x200s has 31 entries and many
holes. this gets rid of the "mapfree: ... losing"
messages on boot.

--- a/sys/src/9/pc64/dat.h

+++ b/sys/src/9/pc64/dat.h

@@ -102,7 +102,7 @@

 	ulong	nmach;		/* processors */

 	ulong	nproc;		/* processes */

 	ulong	monitor;	/* has monitor? */

-	Confmem	mem[4];		/* physical memory */

+	Confmem	mem[16];	/* physical memory */

 	ulong	npage;		/* total physical pages of memory */

 	ulong	upages;		/* user page pool */

 	ulong	nimage;		/* number of page cache image headers */

--- a/sys/src/9/pc64/memory.c

+++ b/sys/src/9/pc64/memory.c

@@ -44,7 +44,7 @@

 /* 

  * Memory allocation tracking.

  */

-static Map mapupa[16];

+static Map mapupa[64];

 static RMap rmapupa = {

 	"unallocated unbacked physical memory",

 	mapupa,