Arm backend: Add example linkerscripts for U55/U85 (#13404)

Add linkerscripts for exector_runner targeting U55/U85 in examples/arm
instead of using the linkerscripts from core_platform and then applying
patches.

The patches are deleted since they are no longer needed.

Signed-off-by: [email protected]

Author: perheld

examples/arm/ethos-u-setup/core_platform/0001-Add-got-section-to-the-DDR.patch

@@ -143,8 +143,47 @@ target_sources(
                               arm_memory_allocator.cpp
 )
 
-# Include the target's bare-metal linker script
-ethosu_eval_link_options(arm_executor_runner)
+# Check for "U55" in SYSTEM_CONFIG
+string(FIND "${SYSTEM_CONFIG}" "U55" U55_FOUND)
+
+# Check for "U85" in SYSTEM_CONFIG
+string(FIND "${SYSTEM_CONFIG}" "U85" U85_FOUND)
+
+# Check if neither "U55" nor "U85" was found
+if(U55_FOUND EQUAL -1 AND U85_FOUND EQUAL -1)
+  message(
+    FATAL_ERROR
+      "SYSTEM_CONFIG does not contain 'U55' or 'U85'. Configuration aborting."
+  )
+endif()
+
+# Proceed with specific actions if either is found
+if(NOT U55_FOUND EQUAL -1)
+  message(STATUS "SYSTEM_CONFIG contains 'U55'.")
+  set(LINK_FILE_IN "${CMAKE_SOURCE_DIR}/Corstone-300.ld")
+endif()
+
+if(NOT U85_FOUND EQUAL -1)
+  message(STATUS "SYSTEM_CONFIG contains 'U85'.")
+  set(LINK_FILE_IN "${CMAKE_SOURCE_DIR}/Corstone-320.ld")
+endif()
+
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+  set(LINK_FILE_EXT ld)
+  set(LINK_FILE_OPTION "-T")
+  set(COMPILER_PREPROCESSOR_OPTIONS -E -x c -P)
+endif()
+
+get_filename_component(LINK_FILE_OUT_BASE ${LINK_FILE} NAME)
+set(LINK_FILE_OUT
+    ${CMAKE_CURRENT_BINARY_DIR}/${LINK_FILE_OUT_BASE}.${LINK_FILE_EXT}
+)
+
+execute_process(
+  COMMAND ${CMAKE_C_COMPILER} ${COMPILER_PREPROCESSOR_OPTIONS} -o
+          ${LINK_FILE_OUT} ${LINK_FILE_IN}
+)
+target_link_options(arm_executor_runner PRIVATE "-T" "${LINK_FILE_OUT}")
 
 set(arm_executor_runner_link)
 list(