regulator: tps65219: Update struct names

Isolate changes that involve renaming to indicate this resource is only for
TPS65219 or if it will be common for both devices. The renames are in
preparation for adding TPS65215 support.

Signed-off-by: Shree Ramamoorthy <s-ramamoorthy@ti.com>
Link: https://patch.msgid.link/20250425205736.76433-2-s-ramamoorthy@ti.com


Signed-off-by: Mark Brown <broonie@kernel.org>