drm/i915/gvt: Swap read and write checks

drm/i915/gvt: Swap read and write checks

The function intel_gvt_i2c_handle_aux_ch_write currently does not
support the DP_AUX_I2C_WRITE operation.  Notably, we check if
op & 0x1 == DP_AUX_I2C_WRITE (one), and if it does not, assert that
op & 0x1 == DP_AUX_I2C_READ (zero).  This is unnecessary because if
op & 0x1 != 1, then op & 0x1 == 0.  But beyond that, it probably makes
more sense to check for the condition that is implemented, rather than
check for the condition that is not.

Swap the conditions.  We can also get rid of the unnecessary drm_WARN_ON
while we're here.

Suggested-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patch.msgid.link/20260204161945.8127-2-jonathan.cavitt@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>