dev-amdgpu: Fix frame writes for <32-bit writes
dev-amdgpu: Fix frame writes for <32-bit writes

In theory a packet between one and eight bytes can be written to frame
buffer memory from the driver. In gem5 pkt->getLE<utin32_t>() will
assert if the packet size is <32-bits. Change to pkt->getUintX(...) to
fix this issue.

Change-Id: If8554013e4ea7bac90985487991d0bf8bdc765ea
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58852
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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