Update link.ld

[davidharrishmc]

Data segment needs to be aligned to prevent store misalignment faults. Change linker script.

[jnk0le]

4KiB of alignment is a lot. Usually 4 or 8 bytes is enough

[davidharrishmc]

I don't think it matters what the alignment is and a multiple of 4k made the obj dump easy to read, but I've changed it to 8 bytes.

[jeremybennett]

Thanks @davidharrishmc. This looks good to me.