Export more config variables

Export some more config variables that will be used to generate
robolectric's build.prop file.

Bug: 122331577
Test: m checkbuild
Change-Id: I39f3436ed5d5c4e730dd3e1f86c840cf6358ec87
diff --git a/android/config.go b/android/config.go
index 2e0750b..84dd66f 100644
--- a/android/config.go
+++ b/android/config.go
@@ -501,6 +501,22 @@
 	return String(c.productVariables.Platform_sdk_codename)
 }
 
+func (c *config) PlatformSecurityPatch() string {
+	return String(c.productVariables.Platform_security_patch)
+}
+
+func (c *config) PlatformPreviewSdkVersion() string {
+	return String(c.productVariables.Platform_preview_sdk_version)
+}
+
+func (c *config) PlatformMinSupportedTargetSdkVersion() string {
+	return String(c.productVariables.Platform_min_supported_target_sdk_version)
+}
+
+func (c *config) PlatformBaseOS() string {
+	return String(c.productVariables.Platform_base_os)
+}
+
 func (c *config) MinSupportedSdkVersion() int {
 	return 16
 }