ARM: dts: omap: omap4-epson-embt2ws: wire up regulators

Wire up the regulators where usage is plausible. Do not
wire them if purpose/usage is unclear like 5V for
many things requiring lower voltages.

Tested on vendor kernel that backlight definitively does not react
on blc_[rl] GPIOs.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20241010122957.85164-3-andreas@kemnade.info


Signed-off-by: Kevin Hilman <khilman@baylibre.com>