Interface: Add 'tz' in file name for entry of TrustZone arch

File tfm_psa_ns_api.c contains unified entries for TrustZone
architectures. Compared with the entry file name for multi core
(tfm_multi_core_psa_ns_api.c), it is confusing for the TZ one being
named like a common file. So rename it to tfm_tz_psa_ns_api.c to make
its purpose easy to understand.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Ib41e523ee39871aaa075b44913da8118379b6c10
diff --git a/cmake/install.cmake b/cmake/install.cmake
index 43f8cb1..107355e 100644
--- a/cmake/install.cmake
+++ b/cmake/install.cmake
@@ -126,7 +126,7 @@
 endif()
 
 if (TFM_PARTITION_NS_AGENT_TZ)
-    install(FILES       ${INTERFACE_SRC_DIR}/tfm_psa_ns_api.c
+    install(FILES       ${INTERFACE_SRC_DIR}/tfm_tz_psa_ns_api.c
             DESTINATION ${INSTALL_INTERFACE_SRC_DIR})
 endif()