ARM: dts: msm: Remove references to BEAC from sdm855 LLCC PMU

The LLCC PMU no longer requires any information about the BEAC to be
properly configured, so remove the register information.

Change-Id: I75d913f417b9744b450a86260141a361ad1d8ef7
Signed-off-by: Jonathan Avila <avilaj@codeaurora.org>