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/hikey960.rst b/docs/plat/hikey960.rst
index 63cfc92..7900b6d 100644
--- a/docs/plat/hikey960.rst
+++ b/docs/plat/hikey960.rst
@@ -11,7 +11,7 @@
 Code Locations
 --------------
 
--  ARM Trusted Firmware:
+-  Trusted Firmware-A:
    `link <https://github.com/ARM-software/arm-trusted-firmware>`__
 
 -  OP-TEE:
@@ -73,7 +73,7 @@
        export EDK2_DIR=${BUILD_PATH}/edk2
        EDK2_OUTPUT_DIR=${EDK2_DIR}/Build/HiKey960/${BUILD_OPTION}_${AARCH64_TOOLCHAIN}
        cd ${EDK2_DIR}
-       # Build UEFI & ARM Trust Firmware
+       # Build UEFI & Trusted Firmware-A
        ${UEFI_TOOLS_DIR}/uefi-build.sh -b ${BUILD_OPTION} -a ../arm-trusted-firmware -s ../optee_os hikey960
 
 -  Generate l-loader.bin and partition table.