meta-romulus: Update VRM control scripts

Romulus VDDR uses different regulator, so the scripts is updated:
1. Remove VDDR related settings in vrm-control.sh
2. Add vrm.sh to invoke vrm-control.sh to set VDN, and invoke i2cset to
set VDDR.

Change-Id: I8be757728833280392328eaf03b3a88b911a4fbd
Signed-off-by: Lei YU <mine260309@gmail.com>
4 files changed