Remove aliases and add symlink

[lorforlinux]

@RobertCNelson, let's try this :)

I don't want to edit the dra7.dtsi at this moment and it seems all the peripheral nodes are in there and most of them are disabled. I will create new nodes for them in am5729-beagleboneai.dts with status = okay after we figure this out.

[jadonk]

Please use then symlink names from https://elinux.org/Beagleboard:BeagleBone_cape_interface_spec and/or update that page.

[lorforlinux]

@jadonk, I will update the page by tonight and submit a pull request for BBB symlinks in the format bone-peripheral#. I hope you agree with the format :)

I will not be able to complete the BBAI symlinks today, It needs some prior work before the assignment of symlinks.

[lorforlinux]

Updated fields on BeagleBone cape interface spec will look like this:

/dev/bone-i2c2

AM3358 I2C2
AM5729 I2C4

    P9.19 - SCL
    P9.20 - SDA