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/utils/Utils.h b/broadcastradio/1.1/utils/Utils.h
index 1110e79..cd86ffa 100644
--- a/broadcastradio/1.1/utils/Utils.h
+++ b/broadcastradio/1.1/utils/Utils.h
@@ -25,7 +25,6 @@
 namespace hardware {
 namespace broadcastradio {
 namespace V1_1 {
-namespace implementation {
 namespace utils {
 
 /**
@@ -61,12 +60,11 @@
 
 ProgramSelector make_selector(V1_0::Band band, uint32_t channel, uint32_t subChannel = 0);
 
-bool getLegacyChannel(const ProgramSelector& sel, uint32_t& channelOut, uint32_t& subChannelOut);
+bool getLegacyChannel(const ProgramSelector& sel, uint32_t* channelOut, uint32_t* subChannelOut);
 
 bool isDigital(const ProgramSelector& sel);
 
 }  // namespace utils
-}  // namespace implementation
 }  // namespace V1_1
 }  // namespace broadcastradio
 }  // namespace hardware