rename: func_800019C8 → StartDPIntroThread

Sets up the DP/VI intro thread. Validates osTvType (early-out
on PAL/NTSC, otherwise blacks the screen and halts). Creates
thread #5 (priority 0x28) with entry func_8000183C, plus two
OSMesgQueues and additional state for the intro sequence.

Still matching: md5 ed1378bc… (verified by `make`)

src/dp_intro.c

@@ -197,7 +197,7 @@ void func_8000183C(UNUSED void* arg) {
     }
 }
 
-void func_800019C8(void) {
+void StartDPIntroThread(void) {
     switch (osTvType) {
         case 1:
         case 2:

src/dp_intro.h

@@ -11,7 +11,7 @@ void func_8000152C(struct UnkArray4* arg0);
 void func_800015A8(void);
 void func_800017E4(void);
 void func_8000183C(UNUSED void* arg);
-void func_800019C8(void);
+void StartDPIntroThread(void);
 void func_80001AD4(u16 color);
 u16 func_80001B2C(void);
 s32 func_80001B40(void);

src/main.c

@@ -27,7 +27,7 @@ void Idle_ThreadEntry(UNUSED void* unused) {
     rsp_init();
     StartRSPThread();
     StartDDThread();
-    func_800019C8();
+    StartDPIntroThread();
     SoftReset_CreateThread();
     osCreateThread(&pThreads, 6, &Game_Thread, 0, &D_800818E0, 20);
     osStartThread(&pThreads);