packages/boot: bump arm-trusted-firmware-mvebu version

The current version of ATF does not support power off for SGMII
COMPHY.  Update to latest ATF to resolve this issue.

Signed-off-by: Scott Roberts <ttocsr@gmail.com>

package/boot/arm-trusted-firmware-mvebu/Makefile

@@ -9,14 +9,14 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=arm-trusted-firmware-mvebu
 PKG_VERSION:=2.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_RELEASE).tar.xz
 PKG_SOURCE_URL:=https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
-PKG_SOURCE_DATE:=2019-10-22
-PKG_SOURCE_VERSION:=a04808c16cfc126d9fe572ae7c4b5a3d39de5796
-PKG_MIRROR_HASH:=ff93aad67227ca96db54e92288f61b4ff3abbaad291fc88ad95c29cd3dd3588c
+PKG_SOURCE_DATE:=2020-01-21
+PKG_SOURCE_VERSION:=3b3d406ebc6f5dae6b5c9170c674183026e7301b
+PKG_MIRROR_HASH:=7c63da237c52808e1fe49458d5a4ac804a8eb4c365e26c6b2b709256e8fc041f
 
 PKG_MAINTAINER:=Vladimir Vid <vladimir.vid@sartura.hr>