arm: elog: don't use eeprom interfaces for read/write

All ARM devices use the region RW_ELOG read via flashrom, so we can
clear-out the platform-specific interfaces and just use flashrom
directly.

BUG=chromium:1028380
TEST="mosys eventlog list" and "mosys eventlog add" on elm

Change-Id: I9b1c230d5887b06f2ba2f7e2cc1020942264c9f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/2489793
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Paul Fagerburg <pfagerburg@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
1 file changed