SAML core includes are wrong

[facchinm]

These includes https://github.com/arduino/ArduinoModule-CMSIS-Atmel/blob/master/CMSIS-Atmel/CMSIS/Device/ATMEL/saml.h#L23 are missing a folder level (another /include/).

See https://github.com/arduino/ArduinoModule-CMSIS-Atmel/blob/master/CMSIS-Atmel/CMSIS/Device/ATMEL/samd.h

[cmaglie]

/cc @aethaniel

[kumajaya]

PR #17 fix this issue.

[WestfW]

Is there a status for this? I just ran into the same issue working on the MattairTech cores.
As far as I can tell, the pull request should be a really safe patch, since it doesn't have any effect on any currently-working core or device.