cmake: Remove armasm workaround for Cortex M55

Author: wernerlewis

tools/cmake/cores/Cortex-M55.cmake

@@ -17,13 +17,6 @@ elseif(${MBED_TOOLCHAIN} STREQUAL "ARM")
     )
 endif()
 
-# We'd like to use just "-mcpu=cortex-m55" in common_options, but due to a bug
-# in armclang passing options to armasm, we use the following flags as a
-# workaround to select M55.
-list(APPEND asm_compile_options
-    -mcpu=cortex-r7
-    -Wa,--cpu=cortex-m55
-)
 
 function(mbed_set_cpu_core_definitions target)
     target_compile_definitions(${target}