htc: declare and begin impl of HtclowManagerImpl interface

libraries/libstratosphere/include/stratosphere/htclow/htclow_channel_types.hpp

@@ -36,6 +36,8 @@ namespace ams::htclow {
 
     struct ChannelConfig {
         bool flow_control_enabled;
+        bool handshake_enabled;
+        size_t max_packet_size;
     };
 
     constexpr bool IsStateTransitionAllowed(ChannelState from, ChannelState to) {

libraries/libstratosphere/include/stratosphere/htclow/htclow_module_types.hpp

@@ -21,6 +21,7 @@ namespace ams::htclow {
 
     enum class ModuleId : u8 {
         Htcfs   = 1,
+
         Htcmisc = 3,
         Htcs    = 4,
     };