arch-x86: Ignore certain syscalls called in ROCm 4
arch-x86: Ignore certain syscalls called in ROCm 4

fdatasync, sigaltstack, and prctl are called by the ROCm 4 stack, but
were unimplemented. Based on testing, we can change these to ignoreFunc
without affecting program correctness.

sched_yield gets changed to ignoreWarnOnceFunc, as it gets called
significantly more in ROCm 4.

Change-Id: I566b1d71d989c54bfc559d5b83790dff73a38b28
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/46241
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Reviewed-by: Matthew Poremba <f1eb50f3368ce197c52b19f7fdb5aa7a278f15fd@amd.com>

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