[coreboot-gerrit] Patch merged into coreboot/master: lib/reg_script: Add display support

the following patch was just integrated into master:
commit 564dc9c7c89a94ff1b7803ef9937ca4f0dd95809
Author: Lee Leahy 
Date:   Fri Apr 29 15:07:19 2016 -0700

lib/reg_script: Add display support

Add the ability to enable the display of the script:
    * Added REG_SCRIPT_COMMAND_DISPLAY to enable and disable display output
    * Added context values to manage display support
      * display_state - Updated by the command to enable or disable display
      * display_features - May be updated by step routine to control what
        the step displays for register and value
      * display_prefix - Prefix to display before register data
    * Added REG_SCRIPT_DISPLAY_ON and REG_SCRIPT_DISPLAY_OFF macros to
      control the display from the register script
    * Added REG_SCRIPT_DISPLAY_REGISTER and REG_SCRIPT_DISPLAY_VALUE as
      two features of the common display.  With these features enabled
      the following is output:
      * Write: <optional prefix> register <-- value
      * Read:  <optional prefix> register --> value

TEST=Build and run on Galileo Gen2

Change-Id: If0d4d61ed8ef48ec20082b327f358fd1987e3fb9
    Signed-off-by: Lee Leahy 
    Reviewed-on: https://review.coreboot.org/14553
    Tested-by: build bot (Jenkins)
    Reviewed-by: Aaron Durbin

See https://review.coreboot.org/14553 for details.

-gerrit