Vulkan F32 matrix loading optimized for Intel platforms.

The official source reports this update: b11266: vulkan : Load F32 A matrix 2 at a time when its 2-aligned. vulkan : Load F32 A matrix 2 at a time when its 2-aligned ( #29254 ) It turns out Intel doesn't particularly like loading F32s one at a time and we already have the _2aliagned load logic in mul_mat_vec, so here we use it. While we do already check all the requirements to load elements 4 at a time across [B]F16 and F32, it turns out [B]F16 loading 4 at a time is sometimes slower on very specific shapes on Intel BMG. Loading 4 at a time is a bit faster on F32, but its not material and I assume might be slower on other platforms.