The command parser is feature complete, stable and required by
userspace. In commit 
41736a8e3331 ("drm/i915: Use the precomputed value
for whether to enable command parsing") I accidentally removed control
from the modparam, and as no one has complained, remove the left
over modparam completely!
References: 
41736a8e3331 ("drm/i915: Use the precomputed value for whether to enable command parsing")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180517150727.10431-1-chris@chris-wilson.co.uk
 i915_param_named(disable_display, bool, 0400,
        "Disable display (default: false)");
 
-i915_param_named_unsafe(enable_cmd_parser, bool, 0400,
-       "Enable command parsing (true=enabled [default], false=disabled)");
-
 i915_param_named(mmio_debug, int, 0600,
        "Enable the MMIO debug code for the first N failures (default: off). "
        "This may negatively affect performance.");
 
        param(unsigned int, inject_load_failure, 0) \
        /* leave bools at the end to not create holes */ \
        param(bool, alpha_support, IS_ENABLED(CONFIG_DRM_I915_ALPHA_SUPPORT)) \
-       param(bool, enable_cmd_parser, true) \
        param(bool, enable_hangcheck, true) \
        param(bool, fastboot, false) \
        param(bool, prefault_disable, false) \