firmware: xilinx: Add ZynqMP Tap Delay setup ioctl to the valid list

The Tap Delay setup ioctl was not added to valid list due to which it
may fail to set Tap Delays for SD. This patch fixes the same.

Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/1579602095-30060-2-git-send-email-manish.narani@xilinx.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>