arm64: dts: ti: drop dependencies on deprecated header file

Drop dependencies on deprecated header file ti-serdes.h to fix below
building issue:

scripts/dtc/include-prefixes/dt-bindings/mux/ti-serdes.h:15:2:
warning:#warning "These bindings are deprecated. Instead, use the header in the DTS source directory." [-Wcpp]
15 | #warning "These bindings are deprecated. Instead, use the header in the DTS source directory."

Signed-off-by: Xulin Sun <xulin.sun@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>