hammer: Support different IC types in touchpad FW update

Some Elan touchpad ICs have a different firmware sizes (48, 56, or 64
KB). We use CONFIG_TOUCHPAD_VIRTUAL_SIZE, set in the board file, to
determine the appropriate size, and, at runtime, we sanity check the
firmware size according to the IC type reported by the touchpad.

BRANCH=none
BUG=b:65188846
TEST=Manually modify the CONFIG_TOUCHPAD_VIRTUAL_SIZE in hammer,
     executed and verified both (1) "EC_ERROR_UNKNOWN" returned
     (2) ic_type shows 0x09 on EC console
TEST=Successfully flashing 48k firmware using CL:658920 on hammer and
     56k firmware on staff. With success here, we specifically test
     with different firmware version and make sure it reflected in
     hammerd's touchpad info.

Change-Id: Ib30917d8376d4a2e8b6137daabad2341ac48d1f8
Signed-off-by: Chun-Ta Lin <itspeter@google.com>
Reviewed-on: https://chromium-review.googlesource.com/664937
Commit-Ready: Chun-ta Lin <itspeter@chromium.org>
Tested-by: Chun-ta Lin <itspeter@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

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