juno: Fix build errors due to recent changes ...

This is a miscellaneous commit that fixes all build
errors introduced by the rebase of the Juno codebase
on the latest trusted firmware.

 - Make codebase consistent in its use of #include "" syntax
   for user includes and #include <> syntax for system includes.

 - Sort header files alphabetically

 - Use tag names for structure types.
   Replace instances of the former io_handle and io_dev_handle
   types with uintptr_t.

 - Review the .c and .S files for which header files really need
   including and reorder the #include statements alphabetically.

Change-Id: I1d409fafb6dc257a38992ee15b22b0e890d040b0

juno: Add a handler for 'ARM Architecture' SMC calls ...

Currently UEFI and Linux are using SMC calls in the 'ARM Architecture'
Owning Entity range so lets implement these to get things working.

UEFI probably doesn't actually need to issue the ID_PRESENCE and ID_UID
calls it does, and the device-tree used by Linux could specify the PSCI
identifiers instead. After those changes, this patch isn't required.

Signed-off-by: Jon Medhurst <tixy@linaro.org>