pbkit quits if the nvclk freq is not default

[GXTX]

It shouldn't do this.

https://github.com/XboxDev/nxdk/blob/master/lib/pbkit/pbkit.c#L2815

[GXTX]

I think something like this would work? Tested on hardware with mesh and triangle sample and appears not to break anything. Someone else can PR.

    DWORD nv_base = 16667; //hz
    DWORD nv_clk = ((nv_base * ndiv) / (odiv << pdiv)) / mdiv;
    DWORD nv = nv_clk;
    DWORD d = 1000000 / 32;

    // taken from linux nv04.c
    while (((nv % 5) == 0) && ((d % 5) == 0)) {
        nv /= 5;
        d /= 5;
    }

    while (((nv % 2) == 0) && ((d % 2) == 0)) {
        nv /= 2;
        d /= 2;
    }

    while (nv > 0xFFFF || d > 0xFFFF) {
        nv >>= 1;
        d >>= 1;
    }

#if DBG
    debugPrint("input freq : %dHz\n", nv_clk);
    debugPrint("num        : %d\n", nv);
    debugPrint("den        : %d\n", d);
    debugPrint("timer freq : %dHz\n", (nv_clk * d) / nv);
#endif

    VIDEOREG(NV_PTIMER_NUMERATOR) = nv;
    VIDEOREG(NV_PTIMER_DENOMINATOR) = d;