lib/Kconfig.debug: properly split hash test kernel entries

lib/Kconfig.debug: properly split hash test kernel entries

Split TEST_HASH so that each entry only has one file.

Note that there's no stringhash test file, but actually
<linux/stringhash.h> tests are performed in lib/test_hash.c.

Link: https://lkml.kernel.org/r/[email protected]
Reviewed-by: David Gow <[email protected]>
Tested-by: David Gow <[email protected]>
Signed-off-by: Isabella Basso <[email protected]>
Cc: Augusto Durães Camargo <[email protected]>
Cc: Brendan Higgins <[email protected]>
Cc: Daniel Latypov <[email protected]>
Cc: Enzo Ferreira <[email protected]>
Cc: Geert Uytterhoeven <[email protected]>
Cc: kernel test robot <[email protected]>
Cc: Rodrigo Siqueira <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>