platform: re-enable HAS_BUILTIN_HRM capability

[jplexer]

This commits re-adds the Heart Rate support for Pebble 2.

Please note that I couldn't test this completely as I borked my hrm by accidentally having the wrong blob (this commit has the right blob though!). @Hexxeh has tested this on his silk bigboard, but it would be cool if someone else could also test this :)

will close #7
requires pebble-dev/pebble-nonfree#1

[gmarull]

let's avoid pulling binary blobs in tree, reasons:

• Licensing (unclear?)
• Binaries blow up git history

I'd suggest creating a sort of https://web.git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/ and add it as a submodule.

[Hexxeh]

let's avoid pulling binary blobs in tree, reasons:

• Licensing (unclear?)
• Binaries blow up git history

I'd suggest creating a sort of https://web.git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/ and add it as a submodule.

Do we want to do the same for the pre-preprocessed fonts that were added, for the same reasons? If so, the firmware name makes less sense. Would a repo named something like pebble-nonfree make sense to contain these things?

[gmarull]

let's avoid pulling binary blobs in tree, reasons:

• Licensing (unclear?)
• Binaries blow up git history

I'd suggest creating a sort of https://web.git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/ and add it as a submodule.

Do we want to do the same for the pre-preprocessed fonts that were added, for the same reasons? If so, the firmware name makes less sense. Would a repo named something like pebble-nonfree make sense to contain these things?

We probably should, yes.

[Hexxeh]

We now have https://github.com/pebble-dev/pebble-nonfree to put these. Let's add the blob there first and then pull it in via this PR. I think we'll have to push an initial commit before you can PR that repo (I can do it but not till this evening since I'm on mobile at the moment).

[jplexer]

removed the blob from my commit, can now be added through a submodule

[Hexxeh]

I added an initial commit to https://github.com/pebble-dev/pebble-nonfree so you can make a PR there to add the blob. Probably best setting up a folder structure like drivers/hrm/as7000 and putting it under there, and then you can submodule it here.

[jplexer]

added flag --enable_silk_hr that can be run at ./waf configure