misc/xilinx_sdfec: remove redundant _{open, release} function

The functions are redundant as they are empty and performed by the misc
driver.

Signed-off-by: Bo Svangård <bo.svangard@sylog.se>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20230422195933.523874-1-bo.svangard@sylog.se


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>