Camera: Document 3.4 metadata selection logic.

Bug: 119575429
Test: Ensure everything still builds.
Change-Id: I6500ab06b8c392310009ecfa0570000742fd069c
Merged-In: I6500ab06b8c392310009ecfa0570000742fd069c
(cherry picked from commit a5cbabbee988b4cfc4c3d45106220b296f7c3a38)
diff --git a/current.txt b/current.txt
index 61dae6d..5dba85b 100644
--- a/current.txt
+++ b/current.txt
@@ -386,7 +386,7 @@
 
 # ABI preserving changes to HALs during Android Q
 f72d23278af99a2f6a9c1d40352b67dbf1f582282f799f88f7235dc7c13892b5 android.hardware.camera.device@3.2::ICameraDeviceSession
-e96190f635b8458b92525bd6e040fec4ccbac22fdd4bc7274a9794ab976362f7 android.hardware.camera.device@3.4::types
+f8a19622cb0cc890913b1ef3e32b675ffb26089a09e02fef4056ebad324d2b5d android.hardware.camera.device@3.4::types
 da33234403ff5d60f3473711917b9948e6484a4260b5247acdafb111193a9de2 android.hardware.configstore@1.0::ISurfaceFlingerConfigs
 21165b8e30c4b2d52980e4728f661420adc16e38bbe73476c06b2085be908f4c android.hardware.gnss@1.0::IGnssCallback
 d702fb01dc2a0733aa820b7eb65435ee3334f75632ef880bafd2fb8803a20a58 android.hardware.gnss@1.0::IGnssMeasurementCallback