ec: Move the common configs to ec_common.xml

There were many common configs between x86_ec_common.xml and
arm_ec_common.xml. This CL moves them to their parent ec_common.xml.

BUG=None
TEST=Started servod with a x86 board and an ARM board

Change-Id: I3ee266e33f6170000e231ba169fc12a576fb00e3
Reviewed-on: https://chromium-review.googlesource.com/443128
Commit-Ready: Wai-Hong Tam <waihong@google.com>
Tested-by: Wai-Hong Tam <waihong@google.com>
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
3 files changed