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 <mchehab+samsung@kernel.org>
Reviewed-by Corentin Labbe <clabbe.montjoie@gmail.com> # For sun4i-ss

Documentation/arm/sti/overview.rst

@@ -1,5 +1,6 @@
-			STi ARM Linux Overview
-			==========================
+======================
+STi ARM Linux Overview
+======================
 
 Introduction
 ------------
@@ -10,15 +11,17 @@ Introduction
   B2000 and B2020 Reference boards.
 
 
-  configuration
-  -------------
+configuration
+-------------
 
   A generic configuration is provided for both STiH415/416, and can be used as the
-  default by
+  default by::
+
 	make stih41x_defconfig
 
-  Layout
-  ------
+Layout
+------
+
   All the files for multiple machine families (STiH415, STiH416, and STiG125)
   are located in the platform code contained in arch/arm/mach-sti
 
@@ -27,7 +30,7 @@ Introduction
   Device Trees.
 
 
-  Document Author
-  ---------------
+Document Author
+---------------
 
   Srinivas Kandagatla <srinivas.kandagatla@st.com>, (c) 2013 ST Microelectronics

Documentation/arm/sti/stih407-overview.rst

@@ -1,5 +1,6 @@
-			STiH407 Overview
-			================
+================
+STiH407 Overview
+================
 
 Introduction
 ------------
@@ -12,7 +13,7 @@ Introduction
     - ARM Cortex-A9 1.5 GHz dual core CPU (28nm)
     - SATA2, USB 3.0, PCIe, Gbit Ethernet
 
-  Document Author
-  ---------------
+Document Author
+---------------
 
   Maxime Coquelin <maxime.coquelin@st.com>, (c) 2014 ST Microelectronics

Documentation/arm/sti/stih415-overview.rst

@@ -1,5 +1,6 @@
-			STiH415 Overview
-			================
+================
+STiH415 Overview
+================
 
 Introduction
 ------------
@@ -7,6 +8,7 @@ Introduction
     The STiH415 is the next generation of HD, AVC set-top box processors
     for satellite, cable, terrestrial and IP-STB markets.
 
-    Features
+    Features:
+
     - ARM Cortex-A9 1.0 GHz, dual-core CPU
     - SATA2x2,USB 2.0x3, PCIe, Gbit Ethernet MACx2

Documentation/arm/sti/stih416-overview.rst

@@ -1,5 +1,6 @@
-			STiH416 Overview
-			================
+================
+STiH416 Overview
+================
 
 Introduction
 ------------

Documentation/arm/sti/stih418-overview.rst

@@ -1,5 +1,6 @@
-			STiH418 Overview
-			================
+================
+STiH418 Overview
+================
 
 Introduction
 ------------
@@ -14,7 +15,7 @@ Introduction
     - HEVC L5.1 Main 10
     - VP9
 
-  Document Author
-  ---------------
+Document Author
+---------------
 
   Maxime Coquelin <maxime.coquelin@st.com>, (c) 2015 ST Microelectronics