media_build: add support for S905/S912

[spycat88]

Self explanatory PR, part of the changes required to bring S905/S912 to LE/master

@kszaq @afl1 @Raybuntu

[Ray-future]

@adamg-xda Have you seen this: #2270?

[spycat88]

I have, there is no specific config in use here, until the PR is merged I obviously can't rebase against it.

[afl1]

Compiling AMLVIDEO driver as loadable kernel module conflicts with other Amlogic based devices.

[spycat88]

@afl1 there is an IF statement around the amlvideo code so it is only compiled as a module for S905 and S912

[Ray-future]

This should not be specific to S905 only. It should support all Amlogic 3.14 devices. Not sure what the plans for mediabuild is. Last I checked with @CvH it is going to be moved to addons.

[CvH]

Buildwise there are no changes, the only change is after the initial build at install().
Instead of hardwiring the kernel to load the module folder kernel/updates/... you can now choose what folder should be loaded (due the addons). The modules itself are build like usual.