drm/amd/display: Fix wrong array size dummy_boolean of dml2_core_calcs_mode_support_locals

[Why]
Coverity reports OVERRUN warning for
CalculateSwathAndDETConfiguration_params->hw_debug5
= &s->dummy_boolean[2].
bool dummy_boolean[2] is defined within
struct dml2_core_calcs_mode_support_locals.

[How]
Change array size from 2 to 3.

Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>