Enable allow_jni_merging for internal targets

Summary:
Noticed we explicitly dropped the `allow_jni_merging` while not actually using it anywhere, and that we didn't have `fbandroid_allow_jni_merging` on some other libs.

Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D32355868

fbshipit-source-id: 6bd3fcc395e3dcacf4a8fc1033d471b2ffb0e8af

ReactAndroid/src/main/java/com/facebook/hermes/instrumentation/BUCK

@@ -33,6 +33,7 @@ rn_xplat_cxx_library(
     header_namespace = "",
     compiler_flags_enable_exceptions = True,  # TODO: is this necessary?
     compiler_flags_enable_rtti = True,  # TODO: is this necessary?
+    fbandroid_allow_jni_merging = True,
     labels = ["supermodule:xplat/default/public.react_native.infra"],
     platforms = ANDROID,
     soname = "libjsijniprofiler.$(ext)",

ReactAndroid/src/main/java/com/facebook/react/turbomodule/core/jni/BUCK

@@ -11,6 +11,7 @@ rn_xplat_cxx_library(
         "ReactCommon/TurboModuleManager.h": "ReactCommon/TurboModuleManager.h",
         "ReactCommon/TurboModuleManagerDelegate.h": "ReactCommon/TurboModuleManagerDelegate.h",
     },
+    fbandroid_allow_jni_merging = True,
     labels = ["supermodule:xplat/default/public.react_native.infra"],
     platforms = ANDROID,
     preprocessor_flags = [