arm64: dts: ti: k3-j721e: Rename mux header and update macro names

We intend to use one header file for SERDES MUX for all
TI SoCs so rename the header file.

The exsting macros are too generic. Prefix them with SoC name.

While at that, add the missing configurations for completeness.

Fixes: b766e3b0 ("arm64: dts: ti: k3-j721e-main: Add system controller node and SERDES lane mux")
Reported-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Peter Rosin <peda@axentia.se>
Link: https://lore.kernel.org/r/20200918165930.2031-1-rogerq@ti.com