EL18 RF USB switch (#2221)

* feature: added ability to have radio specific menu items in the bootloader
* added enabling/disabling USB access to the RF module via the bootloader
* enable the internal module on EL18, when RF module USB access is enabled
* moved USB switch pin initialization to the NV14/EL18 specific code
* moved EL18 USB switch defines to boot_menu
* feat: added a symbol for RF USB switch menu option on EL18 bootloader

radio/src/targets/horus/bootloader/boot_menu.cpp

@@ -216,6 +216,16 @@ void bootloaderDrawFilename(const char* str, uint8_t line, bool selected)
     }
 }
 
+uint32_t bootloaderGetMenuItemCount(int baseCount)
+{
+    return baseCount;
+}
+
+bool bootloaderRadioMenu(uint32_t menuItem, event_t event)
+{
+    return true;
+}
+
 void blExit(void)
 {
   lcdClear();