device-xiaomi-santoni:
* Added initial audio support (generated by xml2ucm)
* Fixed splash screen size (720x1280), which also fixes the screen
  showing "posma"

firmware-xiaomi-santoni:
* Firmware files are added (contains ADSP and WCNSS firmwares), these
* files are from Developer ROM 03/29 by Xiaomi.

linux-xiaomi-santoni:
* Kernel updated to 3.18.138.
* Modernized GCC, it'll now compile with the latest GCC from Alpine.

[ci:skip-build]: already built successfully in CI

device-xiaomi-santoni: use mdss-fb-init-hack to refresh the display, and
swapfile to fix "out of memory" when loading proprietary blobs.

I have tested the kernel, USB Networking, Display, USB OTG, Wi-Fi (with
proprietary blobs) works fine, through I haven't figured out how to get
Bluetooth and among of other stuff to work. Audio works. For more
information on how to get Wi-Fi and Audio to work, check out the wiki
page for this device, I have updated it.

[ci:skip-build]: already built successfully in CI

For #157 [skip ci]

Use the device's architecture instead of noarch. Because the device
packages should never be built for other architectures, even if all
depends can be built for other arches as well.

This simplifies package building as part of the new build
infrastructure effort.

pmbootstrap has also been changed to output this by default in
aportgen.

The `msm-fb-refresher` updates the screen for msm based devices. It is
not needed for all devices, so we had some extra code in the initramfs,
that would only add it when the `deviceinfo_msm_refresher` variable was
set. However, we are able now to add files to initramfs hooks, so this
hack can be removed and simplify everything.

Changes:
* Remove `deviceinfo_msm_refresher` from all deviceinfos
* Add sanity check for it
* Move all `deviceinfo` sanity checks to an extra function
* `postmarketos-mkinitfs`: remove code for msm refresher
* `msm-fb-refresher`: add initramfs hook