Sync with DebugFS driver API v2

The DebugFS driver now supports handling multiple SPs, which caused
changes in the API. This commit is to get in sync with those.

Signed-off-by: Balint Dobszay <balint.dobszay@arm.com>
Change-Id: I6481460b78ef977204c77480ed1798737469b990
diff --git a/external/LinuxFFAUserShim/LinuxFFAUserShim.cmake b/external/LinuxFFAUserShim/LinuxFFAUserShim.cmake
index 7deaf69..0abdd47 100644
--- a/external/LinuxFFAUserShim/LinuxFFAUserShim.cmake
+++ b/external/LinuxFFAUserShim/LinuxFFAUserShim.cmake
@@ -18,7 +18,7 @@
 	else()
 		set(LINUX_FFA_USER_SHIM_URL "https://git.gitlab.arm.com/linux-arm/linux-trusted-services.git"
 				CACHE STRING "Linux FF-A user space shim repository URL")
-		set(LINUX_FFA_USER_SHIM_REFSPEC "v1.0.0"
+		set(LINUX_FFA_USER_SHIM_REFSPEC "v2.1.0"
 				CACHE STRING "Linux FF-A user space shim git refspec")
 
 		find_program(GIT_COMMAND "git")