update HIP_UMA #7399 (#7414)
* update HIP_UMA #7399
add use of hipMemAdviseSetCoarseGrain when LLAMA_HIP_UMA is enable.
- get x2 on prompte eval and x1.5 on token gen with rocm6.0 on ryzen 7940HX iGPU (780M/gfx1103)
* simplify code, more consistent style
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Co-authored-by: slaren <slarengh@gmail.com>
