error #2638: The alignment of an array element is greater than the element size

# Issue
When using the `__shared()` macro with a single byte variable, the error `error #2638: The alignment of an array element is greater than the element size` occurs. This happens because the `FRAM_data_t` struct alignment is 2 bytes, while its contents are only 1 byte.

# How to reproduce
Create a thread with the following shared variables:
```c
__shared(
    uint8_t some_byte;
)
```