v3: fpga: add register map to fpga documentation

BUG=b:306446146
TEST=none

Change-Id: Ifddbf27869a2004dfd93b1ed5f0f1b393e866b66
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/chameleon/+/5540592
Tested-by: Michał Headcrab Crowbar Barnaś <barnas@google.com>
Reviewed-by: Tomasz Michalec <tmichalec@google.com>
Commit-Queue: Michał Headcrab Crowbar Barnaś <barnas@google.com>
2 files changed