driver: synopsys: emmc: Do not change FIFO TH as this breaks some platforms

Designware MMC DMA FIFO threshold shouldn't be changed as it broke
Poplar platform's uboot MMC

Signed-off-by: Tien Hock, Loh <tien.hock.loh@intel.com>
Change-Id: I87ec9d5a78e1bf45119cb73797e402b25a914c13
1 file changed