uml: remove __u64 usage from physical memory subsystem

Eliminate some uses of __u64 in the physical memory support.  It's hard to get
a definition of __u64 in both kernel and userspace code on x86_64, so this
changes them to unsigned long long.

There are also a copyright update and formatting comment removal from the
affected header.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/kernel/physmem.c

@@ -115,7 +115,7 @@ void __init setup_physmem(unsigned long start, unsigned long reserve_end,
 		     len - bootmap_size - reserve);
 }
 
-int phys_mapping(unsigned long phys, __u64 *offset_out)
+int phys_mapping(unsigned long phys, unsigned long long *offset_out)
 {
 	int fd = -1;