drm/amd/display: replace dio encoder access

[WHY]
replace dio encoder access to work with new dio encoder
assignment.

[HOW}
1. before validation, access dio encoder by get_temp_dio_link_enc()
2. af

drm/amd/display: replace dio encoder access

[WHY]
replace dio encoder access to work with new dio encoder
assignment.

[HOW}
1. before validation, access dio encoder by get_temp_dio_link_enc()
2. after validation, access dio encoder through pipe_ctx->link_res

Reviewed-by: Wenjing Liu <[email protected]>
Reviewed-by: Meenakshikumar Somasundaram <[email protected]>
Signed-off-by: Peichen Huang <[email protected]>
Signed-off-by: Zaeem Mohamed <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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