phy: sun4i-usb: Remove .disc_thresh where not applicable

.disc_thresh is not used when .type = sun50i_h6_phy, so providing a
value for it is misleading.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://lore.kernel.org/r/20220203013558.11490-2-samuel@sholland.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/allwinner/phy-sun4i-usb.c

@@ -962,7 +962,6 @@ static const struct sun4i_usb_phy_cfg sun50i_a64_cfg = {
 static const struct sun4i_usb_phy_cfg sun50i_h6_cfg = {
 	.num_phys = 4,
 	.type = sun50i_h6_phy,
-	.disc_thresh = 3,
 	.phyctl_offset = REG_PHYCTL_A33,
 	.dedicated_clocks = true,
 	.phy0_dual_route = true,