Change the I2C implementation to use generics

[JADarius]

Pull Request Overview

This pull request modifies the I2C HIL and capsules to use generics.

Code sizes:

Old imix:
text data bss dec hex
175092 0 28568 203660 31b8c
New imix:
text data bss dec hex
174836 0 28556 203392 31a80

Old microbit:
text data bss dec hex
106500 0 15788 122288 1ddb0
New microbit:
text data bss dec hex
106500 0 15772 122272 1dda0

Old stm32f3discovery:
text data bss dec hex
100356 0 16632 116988 1c8fc
New stm32f3discovery:
text data bss dec hex
100356 0 16616 116972 1c8ec

Old hifive:
text data bss dec hex
77388 12 7320 84720 14af0
New hifive:
text data bss dec hex
75276 12 6932 82220 1412c

Pros

• this allows the compiler to perform better optimization and function inlining;
• smaller code size.

Cons

• writing I2C drivers is more verbose as data types are longer;
• SMBus was optional, this uses an "empty" implementation.

TODO or Help Wanted

Feedback would be highly appreciated.

Documentation Updated

• No updates are required.

Formatting

• Ran make prepush.

[bradjc]

I think we discussed how it makes sense to get this inline with SPI.

[bradjc]

bors r+

[bors]

Build succeeded!

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