[Zvk Code Samples] Update .gitignore

- Add the current test binaries to the ignore file, remove
  the obsolete one (zvkb-test).
- Remove the "<something>-test.s" files from the ignore file.
  In some ancient times they used to be generated during
  compilation as an intermediate step.

Signed-off-by: Eric Gouriou <[email protected]>

doc/vector/code-samples/.gitignore

@@ -55,15 +55,11 @@ dkms.conf
 __pycache__
 cscope.out
 aes-cbc-test
-aes-cbc-test.s
 aes-gcm-test
-aes-gcm-test.s
 sha-test
-sha-test.s
 sm3-test
-sm3-test.s
 sm4-test
-sm4-test.s
 test-vectors
-zvkb-test
-zvkb-test.s
+zvbb-test
+zvbc-test
+zvkg-test