PCHG: Flash multiple binaries in one update sessionstabilize-13982.51.B-main

CTN730 firmware consists of separate binaries and currently each binary
is flashed in a separate session. This does not work if two binaries
need to be updated at the same time because each session writes a new
version (after closing the session) and CTN730 refuses to open a session
if the version number is the same.

This patch makes ectool write multiple binaries in one update session.

Example session:

localhost ~ # ectool pchg 0 update 0x1041 0x201200 /tmp/user_ee.bin \
              0x207000 /tmp/WLC_Host_UserApp_CRC.bin
Opened update session (port=0 ver=0x1041 bsize=128):
Writing /tmp/user_ee.bin (3072 bytes).
********************************************************************
Writing /tmp/WLC_Host_UserApp_CRC.bin (90624 bytes).
********************************************************************
Firmware is updated successfully (CRC32=0x5ef03e4d).

localhost ~ # ectool pchg 0 reset
Reset port 0 complete.

localhost ~ # ectool pchg 0
State: ENABLED (2)
Battery: 0%
Errors: 0x0
FW Version: 0x1041
Dropped events: 0

BUG=b:182600604, b:173235954
BRANCH=trogdor
TEST=See the description above.

Change-Id: I554ae560947e896ae73979c85d637f32d3e114af
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2952836
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
(cherry picked from commit 417c1411ed94cdbc27e99a3ca829b786b9a4ec4e)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2970901

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