Declare `ConversionResult` in `android` namespace

Previously the declaration was depending on the `BACKEND_NDK`
define, and `ConversionResult` could end up in the `aidl` NS
(::aidl::ConversionResult). Having it in `android` is more
convenient as it works for nested namespaces of `android`, for
example `android::effect`.

Added alias `aidl::android::ConversionResult` for the NDK
backend case.

Bug: 205884982
Test: m
Change-Id: Ic3238144d35afb86db57d5d620f2f28ccd89021e
Merged-In: Ic3238144d35afb86db57d5d620f2f28ccd89021e
diff --git a/media/libaudiohal/impl/effectsAidlConversion/AidlConversionDynamicsProcessing.h b/media/libaudiohal/impl/effectsAidlConversion/AidlConversionDynamicsProcessing.h
index 6bab18d..c5d5a54 100644
--- a/media/libaudiohal/impl/effectsAidlConversion/AidlConversionDynamicsProcessing.h
+++ b/media/libaudiohal/impl/effectsAidlConversion/AidlConversionDynamicsProcessing.h
@@ -36,18 +36,18 @@
     status_t setParameter(utils::EffectParamReader& param) override;
     status_t getParameter(utils::EffectParamWriter& param) override;
 
-    aidl::ConversionResult<
+    ConversionResult<
             aidl::android::hardware::audio::effect::DynamicsProcessing::ChannelConfig>
     readChannelConfigFromParam(utils::EffectParamReader& param);
-    aidl::ConversionResult<aidl::android::hardware::audio::effect::DynamicsProcessing::EqBandConfig>
+    ConversionResult<aidl::android::hardware::audio::effect::DynamicsProcessing::EqBandConfig>
     readEqBandConfigFromParam(utils::EffectParamReader& param);
-    aidl::ConversionResult<
+    ConversionResult<
             aidl::android::hardware::audio::effect::DynamicsProcessing::MbcBandConfig>
     readMbcBandConfigFromParam(utils::EffectParamReader& param);
-    aidl::ConversionResult<
+    ConversionResult<
             aidl::android::hardware::audio::effect::DynamicsProcessing::LimiterConfig>
     readLimiterConfigFromParam(utils::EffectParamReader& param);
-    aidl::ConversionResult<
+    ConversionResult<
             aidl::android::hardware::audio::effect::DynamicsProcessing::EngineArchitecture>
     readEngineArchitectureFromParam(utils::EffectParamReader& param);