Remove code about mixed sepolicy build

There is no one actively using mixed sepolicy build, and it made
sepolicy codes too complicated. As we are deprecating mixed build,
removing such code for cleanup.

Bug: 298305798
Test: boot cuttlefish
Change-Id: I8beedd5a281fa957532deecb857da4e1bb66992a
diff --git a/mac_permissions/Android.bp b/mac_permissions/Android.bp
index 401f78c..16132c6 100644
--- a/mac_permissions/Android.bp
+++ b/mac_permissions/Android.bp
@@ -72,14 +72,14 @@
 mac_permissions {
     name: "vendor_mac_permissions.xml",
     keys: [
-        ":keys.conf{.plat_vendor_for_vendor}",
+        ":keys.conf{.plat_vendor}",
         ":keys.conf{.vendor}",
-        ":keys.conf{.reqd_mask_for_vendor}",
+        ":keys.conf{.reqd_mask}",
     ],
     srcs: [
-        ":mac_permissions.xml{.plat_vendor_for_vendor}",
+        ":mac_permissions.xml{.plat_vendor}",
         ":mac_permissions.xml{.vendor}",
-        ":mac_permissions.xml{.reqd_mask_for_vendor}",
+        ":mac_permissions.xml{.reqd_mask}",
     ],
     vendor: true,
 }
@@ -88,11 +88,11 @@
     name: "odm_mac_permissions.xml",
     keys: [
         ":keys.conf{.odm}",
-        ":keys.conf{.reqd_mask_for_vendor}",
+        ":keys.conf{.reqd_mask}",
     ],
     srcs: [
         ":mac_permissions.xml{.odm}",
-        ":mac_permissions.xml{.reqd_mask_for_vendor}",
+        ":mac_permissions.xml{.reqd_mask}",
     ],
     device_specific: true,
 }