Revert "Add patch to try to fix NAVI10 flickering"

Doesn't apply cleanly to 5.10.  Not trivial to resolve.

This reverts commit 598f487e.

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,