TI BeaglePlay - Enabling new RDK-B Platform

Reason for change: Beagleplay TI BSP layer + RDK-B porting layer fetcher

[Added] rdkb-beagleplay-extsrc.xml
        * TI BSP layer meta-ti
        * Toolchain - meta-arm
        * RDK-B porting layer - meta-cmf-ti
        * Beagleplay HAL component - rdkb-hal-beagleplay (RPI adpation)

Test Procedure: Project fetch for RDK-B
repo init -u https://code.rdkcentral.com/r/rdkcmf/manifests -m rdkb-beagleplay-extsrc.xml -b hackathon2025/RDKB_Enabler
repo sync --no-clone-bundle --no-tags

Risks: Low (RDK-B layer for beagleplay continues on update)

Change-Id: I8033a3fbf8d7eacafe12284e1f7aeecb3494a6d9
Signed-off-by: Pintu Sakariya <pintu.sakariya@tcs.com>