HSD #15013743257:dt-bindings: usb:rename agilex5 dwc3 binding

commit c68b4a7724b3fb1ba6696a17993ef3a34f82f4e8 from
https://github.com/altera-opensource/linux-socfpga.git

 socfpga-6.1.55-lts.

Rename binding to cater for future socfpga products.

Signed-off-by: Adrian Ng Ho Yin <adrian.ho.yin.ng@intel.com>
Signed-off-by: Liwei Song <liwei.song@windriver.com>