adding bao-console functions (i2cdetect and cute)

[samchin]

Summary

This adds two functions to bao-console.

cute prints cute ascii art.
i2cdetect scans the bus or a specific address and returns whether or not a chip is present. Inspired by the linux i2cdetect.

Test Plan

All of these should be tested in bao-console.

i2cdetect

Run i2cdetect scan and expect to see the following:

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- 34 -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- 47 -- -- -- -- -- -- -- --
50: -- -- -- -- -- 55 -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

also run i2cdetect probe 34 and expect to see:

Device found at address 34

As extra credit, you can plug in the BMP180 and plug and unplug it and see it work.

cute

Follow the help text and enjoy some cute ascii art.

[samchin]

Okay. This is now rebased to include console flags. I just built with both the battery-readout" feature and was able to still use i2cdetect

[bunnie]

This PR actually includes the reduced swap.img file size so we don't need to make a separate one.