Move utils lib out from implementation namespace.

RadioService may benefit from it too.

Also, fix subchannel base, as I found a tiny comment about it in the 1.0 HAL.

Bug: b/32621193
Test: instrumentalization
Change-Id: I11939025b72bdeab4cc6393e25159f53164e22ed
diff --git a/broadcastradio/1.1/default/Tuner.cpp b/broadcastradio/1.1/default/Tuner.cpp
index a36ec3f..3c43c2e 100644
--- a/broadcastradio/1.1/default/Tuner.cpp
+++ b/broadcastradio/1.1/default/Tuner.cpp
@@ -98,7 +98,7 @@
     ProgramInfo info11 = {};
     auto& info10 = info11.base;
 
-    utils::getLegacyChannel(selector, info10.channel, info10.subChannel);
+    utils::getLegacyChannel(selector, &info10.channel, &info10.subChannel);
     info11.selector = selector;
     info11.flags |= ProgramInfoFlags::MUTED;