Add patch to try to fix NAVI10 flickering

See: https://gitlab.freedesktop.org/drm/amd/-/issues/1341
See: https://patchwork.freedesktop.org/patch/397118/

files/portage/patches/sys-kernel/gentoo-sources/drm-amdgpu-swsmu-drop-smu-i2c-bus-on-navi1x.patch

+diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+index 8d8081c6bd38..9cf97744b67e 100644
+--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
++++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+@@ -2534,29 +2534,6 @@ static const struct i2c_algorithm navi10_i2c_algo = {
+ 	.functionality = navi10_i2c_func,
+ };
+ 
+-static int navi10_i2c_control_init(struct smu_context *smu, struct i2c_adapter *control)
+-{
+-	struct amdgpu_device *adev = to_amdgpu_device(control);
+-	int res;
+-
+-	control->owner = THIS_MODULE;
+-	control->class = I2C_CLASS_SPD;
+-	control->dev.parent = &adev->pdev->dev;
+-	control->algo = &navi10_i2c_algo;
+-	snprintf(control->name, sizeof(control->name), "AMDGPU SMU");
+-
+-	res = i2c_add_adapter(control);
+-	if (res)
+-		DRM_ERROR("Failed to register hw i2c, err: %d\n", res);
+-
+-	return res;
+-}
+-
+-static void navi10_i2c_control_fini(struct smu_context *smu, struct i2c_adapter *control)
+-{
+-	i2c_del_adapter(control);
+-}
+-
+ static ssize_t navi10_get_gpu_metrics(struct smu_context *smu,
+ 				      void **table)
+ {
+@@ -2687,8 +2664,6 @@ static const struct pptable_funcs navi10_ppt_funcs = {
+ 	.set_default_dpm_table = navi10_set_default_dpm_table,
+ 	.dpm_set_vcn_enable = navi10_dpm_set_vcn_enable,
+ 	.dpm_set_jpeg_enable = navi10_dpm_set_jpeg_enable,
+-	.i2c_init = navi10_i2c_control_init,
+-	.i2c_fini = navi10_i2c_control_fini,
+ 	.print_clk_levels = navi10_print_clk_levels,
+ 	.force_clk_levels = navi10_force_clk_levels,
+ 	.populate_umd_state_clk = navi10_populate_umd_state_clk,