igt/gem_softpin: Fix MI_STORE_DWORD_IMM for gen2-3
igt/gem_softpin: Fix MI_STORE_DWORD_IMM for gen2-3

Before gen4, MI_STORE_DWORD was just 3 dwords long (cmd, offset, value).

Signed-off-by: Chris Wilson <711c73f64afdce07b7e38039a96d2224209e9a6c@chris-wilson.co.uk>

tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools