Add missing RVL .init splits (#2989)

* Fix Debug_BBA being in the wrong split for GCN

* Add .init splits/symbols for Wii versions

* Fix incorrect relocations detected to __check_pad3 for Wii

* Add .init splits and fix __check_pad3 for Shield versions

src/dolphin/os/OSThread.c

@@ -873,7 +873,3 @@ void* OSGetThreadSpecific(s32 index) {
 
     return NULL;
 }
-
-#include "global.h"
-extern u8 Debug_BBA;
-u8 Debug_BBA ATTRIBUTE_ALIGN(8);

src/dolphin/os/__start.c

@@ -1,6 +1,8 @@
 #include <dolphin/dolphin.h>
 #include "__ppc_eabi_linker.h"
 
+static u8 Debug_BBA;
+
 extern void InitMetroTRK();
 extern void exit(int);
 extern int main(int argc, char* argv[]);