Revert "drm/i915/display/psr: Do full fetch when handling multi-planar formats"

This reverts commit 1f61f065.

Now we are supporting selective fetch for biplanar formats.
We can revert WA patch which forced using full fetch for biplanar
formats.

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211021101024.13112-3-jouni.hogander@intel.com