memory: tegra: Delete duplicated argument to '|' in function tegra210_emc_r21021_periodic_compensation

In function tegra210_emc_r21021_periodic_compensation when calculate
emc_cfg EMC_CFG_DRAM_CLKSTOP_PD is duplicated.
Signed-off-by: Ye Bin <yebin10@huawei.com>
Link: https://lore.kernel.org/r/20200903021542.315195-1-yebin10@huawei.comSigned-off-by: Krzysztof Kozlowski <krzk@kernel.org>