arm64: defconfig: Add CDNS_DSI and CDNS_PHY config

arm64: defconfig: Add CDNS_DSI and CDNS_PHY config

Enable configs for cdns-dsi and cdns-dphy drivers required for DSI
display on the following platforms:
J721E-EVM, J721E-BeagleBone-AI64, J721S2-EVM, AM68-SK, J722S-EVM,
BeagleY-AI, AM62P5-SK, J784S4-EVM and J742S2-EVM

The DSI wrapper driver used by all the above mentioned platforms,
cdns-dsi-j721e is enabled by default if cdns-dsi config is enabled.

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Reviewed-by: Judith Mendez <jm@ti.com>
Link: https://lore.kernel.org/r/20250416182930.32132-1-j-choudhary@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>