Change alignment in linker script, to remove build warning with I2S lib

[sandeepmistry]

As suggested by @facchinm.

[ArduinoBot]

✅ Build completed.

⬇️ Build URL: http://downloads.arduino.cc/PR/samd/package_samd-b119_index.json

ℹ️ To test this build:

1. Open the Preferences of the Arduino IDE.
2. Add the Build URL above in the Additional Boards Manager URLs field, and click OK.
3. Open the Boards Manager (menu Tools->Board->Board Manager...)
4. Install Arduino SAMD core - Pull Request Change alignment in linker script, to remove build warning with I2S lib #186
5. Select one of the boards under SAMD Pull Request Change alignment in linker script, to remove build warning with I2S lib #186 in Tools->Board menu
6. Compile/Upload as usual