SPKI: Remove legacy config definitions (#3342)

Remove legacy config file definitions that are no longer used in v2
of the scion-pki tool.

go/tools/scion-pki/internal/v2/conf/BUILD.bazel

@@ -3,8 +3,6 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 go_library(
     name = "go_default_library",
     srcs = [
-        "as.go",
-        "isd.go",
         "key.go",
         "trc.go",
         "validity.go",
@@ -13,32 +11,25 @@ go_library(
     visibility = ["//go/tools/scion-pki:__subpackages__"],
     deps = [
         "//go/lib/addr:go_default_library",
-        "//go/lib/common:go_default_library",
         "//go/lib/scrypto:go_default_library",
         "//go/lib/scrypto/cert/v2:go_default_library",
         "//go/lib/scrypto/trc/v2:go_default_library",
         "//go/lib/serrors:go_default_library",
         "//go/lib/util:go_default_library",
         "//go/tools/scion-pki/internal/pkicmn:go_default_library",
         "@com_github_burntsushi_toml//:go_default_library",
-        "@com_github_go_ini_ini//:go_default_library",
     ],
 )
 
 go_test(
     name = "go_default_test",
     srcs = [
-        "as_test.go",
-        "isd_test.go",
         "key_test.go",
         "trc_test.go",
     ],
     data = ["//go/tools/scion-pki/internal/v2/conf/testdata:data"],
     embed = [":go_default_library"],
     deps = [
-        "//go/lib/addr:go_default_library",
-        "//go/lib/scrypto:go_default_library",
-        "//go/lib/xtest:go_default_library",
         "//go/tools/scion-pki/internal/v2/conf/testdata:go_default_library",
         "@com_github_stretchr_testify//assert:go_default_library",
         "@com_github_stretchr_testify//require:go_default_library",