Add conscrypt module to sdk extensions

Add visibility of the sdkinfo proto, as well as an enum for the module
to be used by SdkExtensions.

Bug: 188787081
Test: m com.android.conscrypt and inspect it
Change-Id: If8655c3328597580408a87e4c6dc4f92547a57e9

proto/sdk.proto

@@ -26,6 +26,7 @@ enum SdkModule {
   UNKNOWN = 0;
 
   // R modules
+  CONSCRYPT = 10;
   IPSEC = 1;
   MEDIA = 2;
   MEDIA_PROVIDER = 3;

tools/Android.bp

@@ -59,6 +59,7 @@ prebuilt_etc {
     installable: false,
     visibility: [
         "//art:__subpackages__",
+        "//external/conscrypt:__subpackages__",
         "//frameworks/av/apex:__subpackages__",
         "//packages/modules/Connectivity:__subpackages__",
         "//packages/modules/IPsec/apex:__subpackages__",