Add #define CONFIG_NO_RW_B for stm32f100
Add #define CONFIG_NO_RW_B for stm32f100

We don't actually use image B for boards with the STM32F and there is
no longer enough space for it.

BUG=none
TEST=locally compiled for Snow

Change-Id: Ic668c718feaef4cf808869474dc05e45a5f7290c
Signed-off-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>

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