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Provide the required plumbing for the stm32 keyboard scan code so that the message layer will pick up keyboard scans. The design is as follows: - When a change in keyboard state is detected, the keyboard matrix scanning code will call the board-specific board_keyboard_scan_ready() function to interrupt the AP. - The AP will initiate a CMDC_KEY_STATE transaction over SPI or I2C - The SPI or I2C driver will call message_process_cmd() to process the command - This in turn will call keyboard_get_scan() to get the latest scan data For SPI: - The AP will initiate an 20-byte (or longer) SPI transaction - The EC will see the command, and provide the keyboard state in response, with the response being part of the same transaction For I2C: - The AP will initiate a 1-byte write to set the EC mode. - The AP will then initiate an 18-byte read, and the EC will send the message including keyboard state BUG=chromium-os:28925 TEST=build on daisy and discovery; run on daisy Change-Id: I905ef9d567e43d85fb851052f67586eff58e1167 Signed-off-by: Simon Glass <sjg@chromium.org>