feat: Raspberry Pi 4/400 Bluetooth over mini UART (H4, Broadcom patchram, firmware mailbox BT_ON); move BT stack to Drivers/Bluetooth

kernel/src/Drivers/Init.cpp

@@ -17,6 +17,7 @@
 #include <Drivers/Storage/Sdhci.hpp>
 #include <Drivers/Storage/Gpt.hpp>
 #include <Drivers/Audio/IntelHda.hpp>
+#include <Drivers/Bluetooth/Bluetooth.hpp>
 #include <Graphics/Framebuffer.hpp>
 #include <Net/Net.hpp>
 #include <Terminal/Terminal.hpp>
@@ -359,6 +360,7 @@ namespace Drivers {
         Pci::ProbeAll(g_driverTable, g_driverTableCount, Pci::ProbePhase::Normal);
         ProbePlatformXhci();
         ProbePlatformSdhci();
+        Bluetooth::ProbePlatformAdapter();
     }
 
     void InitializeNetwork() {
@@ -373,8 +375,9 @@ namespace Drivers {
 
     void InitializeAudio() {
         // HDA driver initializes during ProbeNormal().
-        // Bluetooth audio (A2DP) initializes automatically during USB enumeration
-        // when a Bluetooth adapter is detected by the xHCI driver.
+        // Bluetooth audio (A2DP) initializes with its adapter: during USB
+        // enumeration, or for an on-board UART controller (Raspberry Pi) from
+        // the platform probe in ProbeNormal().
     }
 
 }