Fixup for r261590 (vnet sysctl handlers cleanup).

Reviewed by:	glebius
Remove the now unused MMU_INIT macro.
Refer newfs and growfs users to fsck_ffs instead of
fsck, the latter does not accept the referred to "-b" flag.

This change was accidently committed directly to 9-STABLE in
r237505.

PR:		82720
Submitted by:	David D.W. Downey
MFC after:	1 week
Use vm_paddr_t, not vm_offset_t, when dealing with physical addresses.

Pointed out by:	alc
No need to set physmem in each initarm() instance anymore, it's handled
in common code now.
Pass the pagetable used from locore.S to initarm to allow it to map data
in as required.
Build libstand as a 64-bit library on ppc64

The 32-bit bootloaders now link against libstand.a in sys/boot/libstand32,
so there is no need to force /usr/lib/libstand.a to be 32-bit.

This is equivalent to r261568 for amd64.

Sponsored by:	The FreeBSD Foundation
Fix the exclude-region clipping logic for the edge-trim case.
Add some extra debugging output when DEBUG is defined.
Pull in r200899 from upstream clang trunk:

  Allow transformation of VariableArray to ConstantArray.

  In the following code:

     struct A { static const int sz; };
     template<class T> void f() { T arr[A::sz]; }

  the array 'arr' is represented as a variable size array in the template.
  If 'A::sz' gets value below in the translation unit, the array in
  instantiation can turn into constant size array.

  This change fixes PR18633.

  Differential Revision: http://llvm-reviews.chandlerc.com/D2688

This fixes "Assertion failed: (T::isKind(*this)), function castAs"
errors, which can occur when building the security/quantis port.

Reported by:	ale
MFC after:	3 days
Add FDT matching code.
Add FDT attachment.
Add FDT attachment, plus minor code shuffle.
Add FDT attachment.
Add FDT attachment. Flag lost functionality with FDT_HACKS so we can
find it later.
Add FDT attachment.
Add TWI attachment for FDT. We're only matching the SAMG20 device for
now, others to follow.
FDT attachment...
Add FDT attachment.
If someone tries to boot a generic ATMEL kernel that has no board_init()
routine compiled in, print a friendly error message about it rather than
mysteriously hanging while trying to init 4GB of nonexistant ram.