adds support for the atmega328 (#9043)

Co-authored-by: Ryan <[email protected]>

docs/spi_driver.md

@@ -11,7 +11,7 @@ No special setup is required - just connect the `SS`, `SCK`, `MOSI` and `MISO` p
 |ATMega16/32U2/4|`B0`|`B1` |`B2`  |`B3`  |
 |AT90USB64/128  |`B0`|`B1` |`B2`  |`B3`  |
 |ATmega32A      |`B4`|`B7` |`B5`  |`B6`  |
-|ATmega328P     |`B2`|`B5` |`B3`  |`B4`  |
+|ATmega328/P    |`B2`|`B5` |`B3`  |`B4`  |
 
 You may use more than one slave select pin, not just the `SS` pin. This is useful when you have multiple devices connected and need to communicate with them individually.
 `SPI_SS_PIN` can be passed to `spi_start()` to refer to `SS`.