[Toybox] [PATCH] Implement i2c utilities.

[enh]

This is enough to cover the use cases of the Android users I know of.

Bug: http://b/115644518
---
 toys/pending/i2ctools.c | 312 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 312 insertions(+)
 create mode 100644 toys/pending/i2ctools.c
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