blinky: Remove unnecessary and incorrect linker script dep

This linker script does not work when compiling for host on
ARM Macs. Furthermore, it is not necessary as we are not currently
tokenizing.

Change-Id: I62f43f47e903fa58c2abbf1d4752f86308a43d64
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/showcase/rp2/+/221053
Commit-Queue: Taylor Cramer <cramertj@google.com>
Reviewed-by: Keir Mierle <keir@google.com>
Pigweed-Auto-Submit: Taylor Cramer <cramertj@google.com>
Commit-Queue: Keir Mierle <keir@google.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>