Build: Remove duplicate add_library(platform_ns)

Create a separate "ns" subdirectory of platform, to separate the build
of platform_ns, so that it can use the settings from preload_ns.cmake.

Signed-off-by: Chris Brand <chris.brand@cypress.com>
Change-Id: If814278414f2d2326167862f73bfd54110dbcbf7
diff --git a/platform/CMakeLists.txt b/platform/CMakeLists.txt
index 74e1d75..c491540 100755
--- a/platform/CMakeLists.txt
+++ b/platform/CMakeLists.txt
@@ -1,5 +1,7 @@
 #-------------------------------------------------------------------------------
 # Copyright (c) 2020-2022, Arm Limited. All rights reserved.
+# Copyright (c) 2022 Cypress Semiconductor Corporation (an Infineon company)
+# or an affiliate of Cypress Semiconductor Corporation. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -8,16 +10,12 @@
 cmake_policy(SET CMP0076 NEW)
 cmake_policy(SET CMP0079 NEW)
 
+add_subdirectory(ns)
+
 add_library(platform_s STATIC)
 add_library(platform_region_defs INTERFACE)
 add_library(platform_common_interface INTERFACE)
 
-# under the multicore topology, NS is declared in the same place as the PSA
-# interface so that it picks up the compiler definitions for the NS CPU
-if(NOT TFM_MULTI_CORE_TOPOLOGY)
-    add_library(platform_ns STATIC EXCLUDE_FROM_ALL)
-endif()
-
 if (BL2)
     add_library(platform_bl2 STATIC)
 endif()
@@ -112,37 +110,6 @@
         ${COMPILER_CP_FLAG}
 )
 
-#========================= Platform Non-Secure ================================#
-
-target_sources(platform_ns
-    PRIVATE
-        $<$<BOOL:${PLATFORM_DEFAULT_UART_STDOUT}>:${CMAKE_CURRENT_SOURCE_DIR}/ext/common/uart_stdout.c>
-        $<$<AND:$<NOT:$<BOOL:${SYMMETRIC_INITIAL_ATTESTATION}>>,$<BOOL:${TEST_NS_ATTESTATION}>>:${CMAKE_CURRENT_SOURCE_DIR}/ext/common/template/tfm_initial_attest_pub_key.c>
-)
-
-target_link_libraries(platform_ns
-    PUBLIC
-        platform_common_interface
-        platform_region_defs
-        tfm_ns_interface
-)
-
-target_compile_definitions(platform_ns
-    PUBLIC
-        # CONFIG_TFM_FP
-        $<$<STREQUAL:${CONFIG_TFM_FP},hard>:CONFIG_TFM_FP=2>
-        $<$<STREQUAL:${CONFIG_TFM_FP},soft>:CONFIG_TFM_FP=0>
-        $<$<BOOL:${TEST_NS_FPU}>:TEST_NS_FPU>
-        $<$<BOOL:${CONFIG_TFM_ENABLE_FPU}>:CONFIG_TFM_ENABLE_FPU>
-    PRIVATE
-        $<$<BOOL:${TEST_NS_SLIH_IRQ}>:TEST_NS_SLIH_IRQ>
-)
-
-target_compile_options(platform_ns
-    PUBLIC
-        ${COMPILER_CP_FLAG}
-)
-
 #========================= Platform BL2 =======================================#
 if(BL2)
     #TODO import policy