mmc: sdhci-pci-gli: Enlarge ASPM L1 entry delay of GL975x

GL975x enters ASPM L1 state after a short idle in default.
Enlarge the idle period to 7.9us for improving the R/W performance.

Signed-off-by: Ben Chuang <benchuanggli@gmail.com>
Link: https://lore.kernel.org/r/20210415032637.5219-1-benchuanggli@gmail.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>