flash_ec: Set NEED_SERVO according to chip name instead of board name

One can pass either a board name (e.g. hammer) or a chip name (stm32)
to the flash_ec command. If given a board name, will map to a proper
chip name and then call its chip-flashing method.

The NEED_SERVO variable ("no" if servo not needed) was set according
to the board name. It was broken if only given a chip name. It should
be set according to the chip name.

BUG=b:68943874
BRANCH=None
TEST=Flashed the Staff firmware
SERVO $ dut-control ec_boot_mode:on
DUT   $ ectool gpioset PP3300_DX_BASE 0
DUT   $ ectool gpioset PP3300_DX_BASE 1
DUT   $ flash_ec --chip stm32_dfu --image staff_ec.bin
SERVO $ dut-control ec_boot_mode:off
DUT   $ ectool gpioset PP3300_DX_BASE 0
DUT   $ ectool gpioset PP3300_DX_BASE 1

Change-Id: I1799f083115bfdf203a405733c5baefadbe3fe3e
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/755614
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

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