Fixed Powerpc SPE data type conversion failure

[Hai Shan]

The following test case failed on Powerpc e500 with CONFIG_SPE

static float fm;
static signed int si_min = (-2147483647 - 1);
static unsigned int ui;
int main()
{
        fm = (float) si_min; ;
        ui = (unsigned int)fm;

        printf("ui=%d, should be %d\n", ui, si_min);

        return 0;
}

Result: ui=-1, should be -2147483648

The reason is failure to emulate the minus float to unsigned conversion instruction
in the SPE driver.

---
 arch/powerpc/math-emu/math_efp.c |   17 +++++++++++++----
 1 files changed, 13 insertions(+), 4 deletions(-)

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