Simplify RAM reset adaptation for modern

src/crt0.s

@@ -91,6 +91,10 @@ Init: @ 8000204
 	ldr r1, =INTR_VECTOR
 	adr r0, IntrMain
 	str r0, [r1]
+	.if MODERN
+	mov r0, #255 @ RESET_ALL
+	swi #1 << 16
+	.endif @ MODERN
 	ldr r1, =AgbMain + 1
 	mov lr, pc
 	bx r1

src/main.c

@@ -85,25 +85,9 @@ void EnableVCountIntrAtLine150(void);
 
 void AgbMain()
 {
-#if MODERN
     // Modern compilers are liberal with the stack on entry to this function,
     // so RegisterRamReset may crash if it resets IWRAM.
-    RegisterRamReset(RESET_ALL & ~RESET_IWRAM);
-    asm("mov\tr1, #0xC0\n"
-        "\tlsl\tr1, r1, #0x12\n"
-        "\tmov r2, #0xFC\n"
-        "\tlsl r2, r2, #0x7\n"
-        "\tadd\tr2, r1, r2\n"
-        "\tmov\tr0, #0\n"
-        "\tmov\tr3, r0\n"
-        "\tmov\tr4, r0\n"
-        "\tmov\tr5, r0\n"
-        ".LCU0:\n"
-        "\tstmia r1!, {r0, r3, r4, r5}\n"
-        "\tcmp\tr1, r2\n"
-        "\tbcc\t.LCU0\n"
-    );
-#else
+#if !MODERN
     RegisterRamReset(RESET_ALL);
 #endif //MODERN
     *(vu16 *)BG_PLTT = 0x7FFF;