drm/amd/display: Add frame_warn_flag to dml2_core_shared.o

When building with tip of tree Clang, there are some new instances of
-Wframe-larger-than from the new display code (which become fatal with
CONFIG_WERROR=y):

  drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c:754:6: error: stack frame size (2488) exceeds limit (2048) in 'dml2_core_shared_mode_support' [-Werror,-Wframe-larger-than]
    754 | bool dml2_core_shared_mode_support(struct dml2_core_calcs_mode_support_ex *in_out_params)
        |      ^
  drivers/gpu/drm/amd/amdgpu/../display/dc/dml2/dml21/src/dml2_core/dml2_core_shared.c:9834:6: error: stack frame size (2152) exceeds limit (2048) in 'dml2_core_shared_mode_programming' [-Werror,-Wframe-larger-than]
   9834 | bool dml2_core_shared_mode_programming(struct dml2_core_calcs_mode_programming_ex *in_out_params)
        |      ^
  2 errors generated.

These warnings do not occur when CONFIG_K{A,C,M}SAN are disabled, so add
$(frame_warn_flag) to dml2_core_shared.o's CFLAGS, which was added in
commit 6740ec97 ("drm/amd/display: Increase frame warning limit with
KASAN or KCSAN in dml2") to account for this situation.

Fixes: 00c39110 ("drm/amd/display: Add misc DC changes for DCN401")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dml2/Makefile

@@ -113,7 +113,7 @@ CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_top/dml2_top_optimization := $(dml2_
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4.o := $(dml2_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.o := $(dml2_ccflags) -Wframe-larger-than=2048
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_core/dml2_core_factory.o := $(dml2_ccflags)
-CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_core/dml2_core_shared.o := $(dml2_ccflags)
+CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_core/dml2_core_shared.o := $(dml2_ccflags) $(frame_warn_flag)
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_dpmm/dml2_dpmm_dcn4.o := $(dml2_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_dpmm/dml2_dpmm_factory.o := $(dml2_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml2/dml21/src/dml2_mcg/dml2_mcg_dcn4.o := $(dml2_ccflags)