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pc, pc64: increase confmem slots to 64

Lenovo Thinkpad P17 Gen1 Professional Mobile Workstation
comes up with around 36 separate memory ranges.

ridiculous!

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

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

@@ -120,7 +120,6 @@

 	ulong	nmach;		/* processors */

 	ulong	nproc;		/* processes */

 	ulong	monitor;	/* has monitor? */

-	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 */

@@ -130,6 +129,7 @@

 	ulong	ialloc;		/* max interrupt time allocation in bytes */

 	ulong	pipeqsize;	/* size in bytes of pipe queues */

 	int	nuart;		/* number of uart devices */

+	Confmem	mem[64];	/* physical memory */

 };

 struct Segdesc

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

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

@@ -122,7 +122,6 @@

 	ulong	nmach;		/* processors */

 	ulong	nproc;		/* processes */

 	ulong	monitor;	/* has monitor? */

-	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 */

@@ -132,6 +131,7 @@

 	ulong	ialloc;		/* max interrupt time allocation in bytes */

 	ulong	pipeqsize;	/* size in bytes of pipe queues */

 	int	nuart;		/* number of uart devices */

+	Confmem	mem[64];	/* physical memory */

 };

 struct Segdesc