graph-depends: remove absent targets from TARGET_EXCEPTIONS

Most of targets listed in TARGET_EXCEPTIONS these days are long
gone, so why still keep them?

Most of those targets were removed in this commit:
http://git.buildroot.net/buildroot/commit/?id=02b88600312554bf166f6cfd71f7f2ede783096a

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/scripts/graph-depends

@@ -186,17 +186,8 @@ def pkg_node_name(pkg):
     return pkg.replace("-","")
 
 TARGET_EXCEPTIONS = [
-    "target-generic-securetty",
-    "target-generic-issue",
-    "target-generic-getty-busybox",
-    "target-generic-do-remount-rw",
-    "target-generic-dont-remount-rw",
     "target-finalize",
-    "erase-fakeroots",
-    "target-generic-hostname",
-    "target-root-passwd",
     "target-post-image",
-    "target-purgelocales",
 ]
 
 # In full mode, start with the result of get_targets() to get the main