ARM: multi_v7_defconfig: Enable TI PRU Ethernet driver

ARM: multi_v7_defconfig: Enable TI PRU Ethernet driver

The Programmable Real-time Unit and Industrial Communication Subsystem
Megabit (ICSSM) is a microcontroller subsystem in TI SoCs such as
AM57x, AM437x, and AM335x. It provides real-time processing
capabilities for industrial communication and custom peripheral interfaces.

Currently, EVMs based on AM57x, AM437x, and AM335x use the ICSSM driver
for PRU-based Ethernet functionality.

This patch enables TI_PRUSS and TI_PRUETH as a module for TI SoCs.

Signed-off-by: Parvathi Pudi <parvathi@couthit.com>
Link: https://lore.kernel.org/r/20251103125451.1679404-1-parvathi@couthit.com
Signed-off-by: Kevin Hilman <khilman@baylibre.com>