arch: arc: Rename ARC64 output format to elf64-littlearc64

This commit renames the ARC64 output format from `elf64-littlearc` to
`elf64-littlearc64` as required by the updated ARC patches for the GCC
12.1 release.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: stephanosio

arch/arc/CMakeLists.txt

@@ -34,7 +34,7 @@ if(COMPILER STREQUAL arcmwdt)
 endif()
 
 if(CONFIG_ISA_ARCV3 AND CONFIG_64BIT)
-  set_property(GLOBAL PROPERTY PROPERTY_OUTPUT_FORMAT elf64-littlearc)
+  set_property(GLOBAL PROPERTY PROPERTY_OUTPUT_FORMAT elf64-littlearc64)
 elseif(CONFIG_ISA_ARCV3 AND NOT CONFIG_64BIT)
   set_property(GLOBAL PROPERTY PROPERTY_OUTPUT_FORMAT elf32-littlearc64)
 else()

include/zephyr/linker/linker-tool-gcc.h

@@ -28,7 +28,7 @@
 	OUTPUT_FORMAT("elf64-littleaarch64")
 #elif defined(CONFIG_ARC)
 	#if defined(CONFIG_ISA_ARCV3) && defined(CONFIG_64BIT)
-		OUTPUT_FORMAT("elf64-littlearc")
+		OUTPUT_FORMAT("elf64-littlearc64")
 	#elif defined(CONFIG_ISA_ARCV3) && !defined(CONFIG_64BIT)
 		OUTPUT_FORMAT("elf32-littlearc64")
 	#else