docs: arm: convert docs to ReST and rename to *.rst

Converts ARM the text files to ReST, preparing them to be an
architecture book.

The conversion is actually:
  - add blank lines and identation in order to identify paragraphs;
  - fix tables markups;
  - add some lists markups;
  - mark literal blocks;
  - adjust title markups.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Reviewed-by Corentin Labbe <[email protected]> # For sun4i-ss

drivers/crypto/sunxi-ss/sun4i-ss-cipher.c

@@ -8,7 +8,7 @@
  * keysize in CBC and ECB mode.
  * Add support also for DES and 3DES in CBC and ECB mode.
  *
- * You could find the datasheet in Documentation/arm/sunxi/README
+ * You could find the datasheet in Documentation/arm/sunxi.rst
  */
 #include "sun4i-ss.h"
 

drivers/crypto/sunxi-ss/sun4i-ss-core.c

@@ -6,7 +6,7 @@
  *
  * Core file which registers crypto algorithms supported by the SS.
  *
- * You could find a link for the datasheet in Documentation/arm/sunxi/README
+ * You could find a link for the datasheet in Documentation/arm/sunxi.rst
  */
 #include <linux/clk.h>
 #include <linux/crypto.h>

drivers/crypto/sunxi-ss/sun4i-ss-hash.c

@@ -6,7 +6,7 @@
  *
  * This file add support for MD5 and SHA1.
  *
- * You could find the datasheet in Documentation/arm/sunxi/README
+ * You could find the datasheet in Documentation/arm/sunxi.rst
  */
 #include "sun4i-ss.h"
 #include <linux/scatterlist.h>

drivers/crypto/sunxi-ss/sun4i-ss.h

@@ -8,7 +8,7 @@
  * Support MD5 and SHA1 hash algorithms.
  * Support DES and 3DES
  *
- * You could find the datasheet in Documentation/arm/sunxi/README
+ * You could find the datasheet in Documentation/arm/sunxi.rst
  */
 
 #include <linux/clk.h>