Remove PlatformVndkVersion property

Platform VNDK version is no longer available based on VNDK deprecation.
Remove all code using Platform VNDK version.

Bug: 330100430
Test: AOSP CF build succeeded
Change-Id: I7d0f7e23eff5d153346890f242a94b78bad6736b
diff --git a/apex/builder.go b/apex/builder.go
index 50db631..9bd4b61 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -277,7 +277,7 @@
 	// VNDK APEX name is determined at runtime, so update "name" in apex_manifest
 	optCommands := []string{}
 	if a.vndkApex {
-		apexName := vndkApexNamePrefix + a.vndkVersion(ctx.DeviceConfig())
+		apexName := vndkApexNamePrefix + a.vndkVersion()
 		optCommands = append(optCommands, "-v name "+apexName)
 	}
 
@@ -1043,7 +1043,7 @@
 	if a.vndkApex {
 		overrideName, overridden := ctx.DeviceConfig().OverrideManifestPackageNameFor(vndkApexName)
 		if overridden {
-			return overrideName + ".v" + a.vndkVersion(ctx.DeviceConfig())
+			return overrideName + ".v" + a.vndkVersion()
 		}
 		return ""
 	}