update to sysutils/arm-trusted-firmware 2.5

Build tested only for lack of hardware.

release notes
https://trustedfirmware-a.readthedocs.io/en/latest/change-log.html#version-2-5

Index: Makefile
===================================================================
RCS file: /cvs/ports/sysutils/arm-trusted-firmware/Makefile,v
retrieving revision 1.15
diff -u -p -r1.15 Makefile
--- Makefile 8 Jan 2021 00:11:17 -0000 1.15
+++ Makefile 10 Jun 2021 05:27:08 -0000
@@ -6,7 +6,7 @@ COMMENT= ARM Trusted Firmware

GH_ACCOUNT= ARM-software
GH_PROJECT= arm-trusted-firmware
-GH_TAGNAME= v2.4
+GH_TAGNAME= v2.5

EPOCH= 0

Index: distinfo
===================================================================
RCS file: /cvs/ports/sysutils/arm-trusted-firmware/distinfo,v
retrieving revision 1.9
diff -u -p -r1.9 distinfo
--- distinfo 8 Jan 2021 00:11:17 -0000 1.9
+++ distinfo 10 Jun 2021 05:27:19 -0000
@@ -1,2 +1,2 @@
-SHA256 (arm-trusted-firmware-2.4.tar.gz) = S/2p/b5QIvLoitM0QWX304qK5KDi2R1E2aFgNCXMZC0=
-SIZE (arm-trusted-firmware-2.4.tar.gz) = 4593582
+SHA256 (arm-trusted-firmware-2.5.tar.gz) = /Ezax8CPw5i21LcFKF3BOsLSswp0ScbwfpzNgSByQd8=
+SIZE (arm-trusted-firmware-2.5.tar.gz) = 5506282