Pin AR28 in vu13p_iic.xdc

[xiongyw]

vu13p_iic.xdc 中 AR28 管脚好像和DDR管脚冲突了，不知道这是不是正常的:

$ rg AR28
vu13p_iic.xdc
1:set_property PACKAGE_PIN  AR28       [get_ports {main_iic_sda}]

ddr4_64/ddr4_c3.xdc
84:set_property PACKAGE_PIN AR28 [get_ports {c3_ddr4_dq[40]}]

ddr4_72/ddr4_c3.xdc
79:set_property PACKAGE_PIN AR28 [get_ports {c3_ddr4_dq[40]}]

[maswx]

还真是，我去找冻哥确认一下。DDR4跑过，都正常的，那就应该是IIC 绑的管脚不对了。