sitlinv_stlv7325: fix ident string vendor name
sitlinv_stlv7325: fix ident string vendor name

As we changed the vendor name to proper Sitlinv in the file name, the
ident string is left untouched.

Fix this too.

Signed-off-by: Icenowy Zheng <f46fab9f9f91073a4262a6bce61dc3d05ad0a078@icenowy.me>

litex-hub/litex-boards