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hk: allow overriding sysmem with an env var

Sergio Lopez requested to merge slp/mesa:hk-sysmem-override into main

What does this MR do and why?

hk: allow overriding sysmem with an env var

When running in a VM, the amount of RAM seen through /proc/meminfo
doesn't necessarily reflect the real amount of memory available in the
system to be used as VRAM. For instance, on a system with 8 GB of
physical RAM, the user might want to run a VM with 2 GB of RAM and still
be able to use 4 GB as VRAM.

To achieve this, allow the reported sysmem to be overridden by the
value (in bytes) of the HK_SYSMEM environment variable.

Signed-off-by: Sergio Lopez <slp@redhat.com>

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