Revert C++ libnx bindings and call-site conversion

Source/hoc-clk/sysmodule/src/board/board_volt.cpp

@@ -31,8 +31,6 @@
 #include "board_freq.hpp"
 #include "board_volt.hpp"
 
-using namespace nx;
-
 namespace board {
 
     GpuVoltData voltData = {};
@@ -659,7 +657,7 @@ namespace board {
             constexpr u32 KNOWN_GOOD_WAR_FREQUENCY = 1'785'000'000;
             u32 hz = board::GetHz(HocClkModule_CPU);
             board::SetHz(HocClkModule_CPU, KNOWN_GOOD_WAR_FREQUENCY);
-            svc::SleepThread(5'000'000);
+            svcSleepThread(5'000'000);
             board::SetHz(HocClkModule_CPU, hz);
         }