intel: Add and use intel_gem_get_context_param()

intel: Add and use intel_gem_get_context_param()

Again sharing the same function across all Intel drivers.

There is still two additional DRM_IOCTL_I915_GEM_CONTEXT_GETPARAM
calls, one in intel/dev and other in perf.
The first one can't call intel_gem_get_context_param() because of the
build order of libs and the second one because it sets the size
parameter.

Will revisit those calls in future but this is already an improvement.

v2:
- using intel_gem_get_context_param() for the recently added query for
I915_CONTEXT_PARAM_PROTECTED_CONTENT

Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18974>