cr50: add more obvious sections in gpio.inc
cr50: add more obvious sections in gpio.inc

Change the comments so it's more obvious what the sections are in
gpio.inc

BUG=none
BRANCH=none
TEST=none

Change-Id: I11566aa1748519df8cdc3cf9269e2a0c90c2dad9
Signed-off-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1443869
Commit-Ready: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>
Tested-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>
Reviewed-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec