Build: Update PSA API test target for Musca B1

Set the variable, so that the PSA API test building cmake doesn't derive
the incorrect name using regex.

Change-Id: Ic858bf86b5eeb502ad1f377f060cd975f8e9353b
Signed-off-by: Raef Coles <raef.coles@arm.com>
diff --git a/platform/ext/target/musca_b1/secure_enclave/config.cmake b/platform/ext/target/musca_b1/secure_enclave/config.cmake
index 0b923c2..34c3058 100644
--- a/platform/ext/target/musca_b1/secure_enclave/config.cmake
+++ b/platform/ext/target/musca_b1/secure_enclave/config.cmake
@@ -1,5 +1,5 @@
 #-------------------------------------------------------------------------------
-# Copyright (c) 2020, Arm Limited. All rights reserved.
+# Copyright (c) 2020-2021, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -23,3 +23,5 @@
 
 # Crypto hardware accelerator is turned on by default
 set(CRYPTO_HW_ACCELERATOR               ON           CACHE BOOL      "Whether to enable the crypto hardware accelerator on supported platforms")
+
+set(PSA_API_TEST_TARGET                 "musca_b1"   CACHE STRING    "Target to use when building the PSA API tests")
diff --git a/platform/ext/target/musca_b1/sse_200/config.cmake b/platform/ext/target/musca_b1/sse_200/config.cmake
index 1b6a0c7..9b45c69 100644
--- a/platform/ext/target/musca_b1/sse_200/config.cmake
+++ b/platform/ext/target/musca_b1/sse_200/config.cmake
@@ -33,3 +33,5 @@
 endif()
 
 set(TFM_EXTRA_GENERATED_FILE_LIST_PATH  ${CMAKE_CURRENT_SOURCE_DIR}/platform/ext/target/musca_b1/generated_file_list.yaml  CACHE PATH "Path to extra generated file list. Appended to stardard TFM generated file list." FORCE)
+
+set(PSA_API_TEST_TARGET                 "musca_b1"   CACHE STRING    "Target to use when building the PSA API tests")