lib/reg_script: Add display support

Hardware / Coreboot - Lee Leahy [intel.com] - 4 May 2016 12:21 UTC

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: register <-- value
- Read: register --> value

TEST=Build and run on Galileo Gen2

Change-Id: If0d4d61ed8ef48ec20082b327f358fd1987e3fb9

564dc9c lib/reg_script: Add display support
src/include/reg_script.h | 22 +++++++++++++
src/lib/reg_script.c | 82 +++++++++++++++++++++++++++++++++++++++-------
2 files changed, 93 insertions(+), 11 deletions(-)

Upstream: review.coreboot.org

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