Update Arm TF references to TF-A

Update Arm Trusted Firmware references in the upstream documents to
Trusted Firmware-A (TF-A). This is for consistency with and
disambiguation from Trusted Firmware-M (TF-M).

Also update other Arm trademarks, e.g. ARM->Arm, ARMv8->Armv8-A.

Change-Id: I8bb0e18af29c6744eeea2dc6c08f2c10b20ede22
Signed-off-by: Dan Handley <dan.handley@arm.com>
Signed-off-by: David Cunado <david.cunado@arm.com>
diff --git a/docs/plat/xilinx-zynqmp.rst b/docs/plat/xilinx-zynqmp.rst
index b9c7825..4280241 100644
--- a/docs/plat/xilinx-zynqmp.rst
+++ b/docs/plat/xilinx-zynqmp.rst
@@ -1,12 +1,12 @@
-ARM Trusted Firmware for Xilinx Zynq UltraScale+ MPSoC
-======================================================
+Trusted Firmware-A for Xilinx Zynq UltraScale+ MPSoC
+====================================================
 
-ARM Trusted Firmware implements the EL3 firmware layer for Xilinx Zynq
+Trusted Firmware-A (TF-A) implements the EL3 firmware layer for Xilinx Zynq
 UltraScale + MPSoC.
-The platform only uses the runtime part of ATF as ZynqMP already has a
+The platform only uses the runtime part of TF-A as ZynqMP already has a
 BootROM (BL1) and FSBL (BL2).
 
-BL31 is ATF.
+BL31 is TF-A.
 BL32 is an optional Secure Payload.
 BL33 is the non-secure world software (U-Boot, Linux etc).
 
@@ -35,20 +35,20 @@
    -  ``cadence``, ``cadence0``: Cadence UART 0
    -  ``cadence1`` : Cadence UART 1
 
-FSBL->ATF Parameter Passing
+FSBL->TF-A Parameter Passing
 ===========================
 
-The FSBL populates a data structure with image information for the ATF. The ATF
-uses that data to hand off to the loaded images. The address of the handoff data
+The FSBL populates a data structure with image information for TF-A. TF-A uses
+that data to hand off to the loaded images. The address of the handoff data
 structure is passed in the ``PMU_GLOBAL.GLOBAL_GEN_STORAGE6`` register. The
-register is free to be used by other software once the ATF is bringing up
+register is free to be used by other software once TF-A has brought up
 further firmware images.
 
 Power Domain Tree
 =================
 
-The following power domain tree represents the power domain model used by the
-ATF for ZynqMP:
+The following power domain tree represents the power domain model used by TF-A
+for ZynqMP:
 
 ::