Hi,
I think you can get it to work again if you simply comment out in lib/cbmem.c line 186 //acpi_slp_type == 0;
and in acpi.c
a return on line 592 this will let the stuff running even when no resume area was defined/filled. The region is still marked reserved although I think you will need bit more fix to Kconfig.
See attached patch. Totally untested but I think it could work.
Rudolf