drm/amd/display: fix HDCP reset sequence on reinitialize

stable inclusion
from stable-5.10.51
commit fb7479d64d77a3bb0ee992f9e450cf52d56c6b2c
bugzilla: 175263 https://gitee.com/openeuler/kernel/issues/I4DT6F

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=fb7479d64d77a3bb0ee992f9e450cf52d56c6b2c

--------------------------------

[ Upstream commit 99c248c4 ]

[why]
When setup is called after hdcp has already setup,
it would cause to disable HDCP flow won’t execute.

[how]
Don't clean up hdcp content to be 0.
Signed-off-by: NBrandon Syu <Brandon.Syu@amd.com>
Reviewed-by: NWenjing Liu <Wenjing.Liu@amd.com>
Acked-by: NWayne Lin <waynelin@amd.com>
Tested-by: NDaniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c

@@ -260,7 +260,6 @@ enum mod_hdcp_status mod_hdcp_setup(struct mod_hdcp *hdcp,
 	struct mod_hdcp_output output;
 	enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
 
-	memset(hdcp, 0, sizeof(struct mod_hdcp));
 	memset(&output, 0, sizeof(output));
 	hdcp->config = *config;
 	HDCP_TOP_INTERFACE_TRACE(hdcp);