Revert "Use the platform SDK version from the config."

This reverts commit 9bef52380933a3f1444607739d94a98506e0b441.

Reason for revert: Broke things

Change-Id: Ic3deac4fb6992572ac0cc95fa04d003e0c29f113
diff --git a/android/config.go b/android/config.go
index 725f43d..f6ca2e7 100644
--- a/android/config.go
+++ b/android/config.go
@@ -323,12 +323,8 @@
 	return "M"
 }
 
-func (c *config) PlatformSdkVersionInt() int {
-	return *c.ProductVariables.Platform_sdk_version
-}
-
 func (c *config) PlatformSdkVersion() string {
-	return strconv.Itoa(c.PlatformSdkVersionInt())
+	return strconv.Itoa(*c.ProductVariables.Platform_sdk_version)
 }
 
 func (c *config) BuildNumber() string {