[libomptarget][amdgpu] Add gfx90a to build list

Author: JonChesterfield

openmp/libomptarget/deviceRTLs/amdgcn/CMakeLists.txt

@@ -107,7 +107,7 @@ else()
 endif()
 
 # create libraries
-set(mcpus gfx700 gfx701 gfx801 gfx803 gfx900 gfx902 gfx906 gfx908 gfx1010 gfx1030 gfx1031)
+set(mcpus gfx700 gfx701 gfx801 gfx803 gfx900 gfx902 gfx906 gfx908 gfx90a gfx1010 gfx1030 gfx1031)
 if (DEFINED LIBOMPTARGET_AMDGCN_GFXLIST)
   set(mcpus ${LIBOMPTARGET_AMDGCN_GFXLIST})
 endif()