doc: Reformat platform port documents

The platform port documents are not very standardised right now and
they don't integrate properly into the document tree so:

1) Make sure each port has a proper name and title (incl. owner)
2) Correct use of headings, subheadings, etc in each port
3) Resolve any naming conflicts between documents

Change-Id: I4c2da6f57172b7f2af3512e766ae9ce3b840b50f
Signed-off-by: Paul Beesley <paul.beesley@arm.com>
diff --git a/docs/plat/nvidia-tegra.rst b/docs/plat/nvidia-tegra.rst
index 6a03b12..bc9e35b 100644
--- a/docs/plat/nvidia-tegra.rst
+++ b/docs/plat/nvidia-tegra.rst
@@ -1,5 +1,5 @@
-Tegra SoCs - Overview
-=====================
+NVIDIA Tegra
+============
 
 -  .. rubric:: T186
       :name: t186
@@ -58,13 +58,13 @@
 workloads.
 
 Directory structure
-===================
+-------------------
 
 -  plat/nvidia/tegra/common - Common code for all Tegra SoCs
 -  plat/nvidia/tegra/soc/txxx - Chip specific code
 
 Trusted OS dispatcher
-=====================
+---------------------
 
 Tegra supports multiple Trusted OS'.
 
@@ -83,7 +83,7 @@
 Tegra186: Trusty
 
 Scatter files
-=============
+-------------
 
 Tegra platforms currently support scatter files and ld.S scripts. The scatter
 files help support ARMLINK linker to generate BL31 binaries. For now, there
@@ -93,7 +93,7 @@
 with ARMCLANG (compilation) and ARMLINK (linking) for the Tegra186 platforms.
 
 Preparing the BL31 image to run on Tegra SoCs
-=============================================
+---------------------------------------------
 
 .. code:: shell
 
@@ -125,7 +125,7 @@
 } plat\_params\_from\_bl2\_t;
 
 Power Management
-================
+----------------
 
 The PSCI implementation expects each platform to expose the 'power state'
 parameter to be used during the 'SYSTEM SUSPEND' call. The state-id field
@@ -133,7 +133,7 @@
 tegra\_def.h.
 
 Tegra configs
-=============
+-------------
 
 -  'tegra\_enable\_l2\_ecc\_parity\_prot': This flag enables the L2 ECC and Parity
    Protection bit, for Arm Cortex-A57 CPUs, during CPU boot. This flag will