Makefile: simplify keys deletion.

Makefile

@@ -115,25 +115,6 @@ clean-keys:
 	rm -rf uefi-keys/
 	shred -uf KEYS_to-save-elsewhere-and-shred/*
 	rm -rf KEYS_to-save-elsewhere-and-shred/*
-	shred -uf uefi-keys/DB.cer uefi-keys/DB.crt uefi-keys/DB.key
-	shred -uf KEYS_to-save-elsewhere-and-shred/DB.auth
-	shred -uf KEYS_to-save-elsewhere-and-shred/DB.cer
-	shred -uf KEYS_to-save-elsewhere-and-shred/DB.crt
-	shred -uf KEYS_to-save-elsewhere-and-shred/DB.esl
-	shred -uf KEYS_to-save-elsewhere-and-shred/DB.key
-	shred -uf KEYS_to-save-elsewhere-and-shred/KEK.auth
-	shred -uf KEYS_to-save-elsewhere-and-shred/KEK.cer
-	shred -uf KEYS_to-save-elsewhere-and-shred/KEK.crt
-	shred -uf KEYS_to-save-elsewhere-and-shred/KEK.esl
-	shred -uf KEYS_to-save-elsewhere-and-shred/KEK.key
-	shred -uf KEYS_to-save-elsewhere-and-shred/PK.auth
-	shred -uf KEYS_to-save-elsewhere-and-shred/PK.cer
-	shred -uf KEYS_to-save-elsewhere-and-shred/PK.crt
-	shred -uf KEYS_to-save-elsewhere-and-shred/PK.esl
-	shred -uf KEYS_to-save-elsewhere-and-shred/PK.key
-	shred -uf KEYS_to-save-elsewhere-and-shred/myGUID.txt
-	shred -uf KEYS_to-save-elsewhere-and-shred/noPK.auth
-	shred -uf KEYS_to-save-elsewhere-and-shred/DB.auth
 
 clean: clean-no-dracut clean-dracut clean-keys