Unit test is not available out of sandbox config

[Kever Yang]

Hi Simon,

     Seems like the Unit test is only available with sandbox now, 
because of the bloblist test depends on the header in sandbox arch,

see the build error:

   CC      test/bloblist.o
   CC      test/env/attr.o
   CC      test/overlay/cmd_ut_overlay.o
   LD      drivers/fastboot/built-in.o
   LD      drivers/built-in.o
test/bloblist.c:10:23: fatal error: asm/state.h: No such file or directory
  #include <asm/state.h>
                        ^
compilation terminated.
   LD      test/log/built-in.o
make[1]: *** [scripts/Makefile.build:265: test/bloblist.o] Error 1
make[1]: *** Waiting for unfinished jobs....


Thanks,

- Kever