dt: Remove booting-without-of.rst

booting-without-of.rst is an ancient document that first outlined
Flattened DeviceTree on PowerPC initially. The DT world has evolved a
lot in the 15 years since and booting-without-of.rst is pretty stale.
The name of the document itself is confusing if you don't understand the
evolution from real 'OpenFirmware'. Most of what booting-without-of.rst
contains is now in the DT specification (which evolved out of the
ePAPR). The few things that weren't documented in the DT specification
are now.

All that remains is the boot entry details, so let's move these to arch
specific documents. The exception is arm which already has the same
details documented.

Cc: Frank Rowand <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Yoshinori Sato <[email protected]>
Cc: Rich Felker <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Acked-by: Benjamin Herrenschmidt <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Acked-by: Michael Ellerman <[email protected]> (powerpc)
Signed-off-by: Rob Herring <[email protected]>

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