[Letux-kernel] minor kernel updates

[H. Nikolaus Schaller]

5.0-rc6
4.20.7
4.19.20

The main changes were to cherry-pick some of Andreas' and Tomis patches
from linux-next to make sure we have the latest version.

And I have cleaned up and checkpatched the iio-input-bridge so that it is almost mature (except
for 80 character line length) for an RFC:

	http://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/letux/iio-input-bridge-v3

Also ready for submission is

	http://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/letux/iio-mount-matrix

Not finished is to add the mount matrices to gta04.dtsi:

	http://git.goldelico.com/?p=letux-kernel.git;a=shortlog;h=refs/heads/work-accelerometer-matrix

This commit should have been squashed into letux/bno055 and is needed to avoid trouble
on the Pyra or GTA04A5 with bno055:

	http://git.goldelico.com/?p=letux-kernel.git;a=commit;h=413fdf9ef07edbb92d45996013c2bdb98f5614f1

So please git cherry-pick 413fdf9ef07edbb92d45996013c2bdb98f5614f1 before compiling letux-5.0-rc6.
I will fix it in -rc7 anyways.

BR,
Nikolaus