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/stm32mp1.rst b/docs/plat/stm32mp1.rst
index 1cfdb84..7adc3c8 100644
--- a/docs/plat/stm32mp1.rst
+++ b/docs/plat/stm32mp1.rst
@@ -1,5 +1,5 @@
-Trusted Firmware-A for STM32MP1
-===============================
+STMicroelectronics STM32MP1
+===========================
 
 STM32MP1 is a microprocessor designed by STMicroelectronics
 based on a dual Arm Cortex-A7.