afdo: Add 5.4 into kernel afdo metadata

5.4 kernel afdo generate builder was recently added.
Add 5.4 into the list for pupr updates.

BUG=b:180725525
TEST=`./afdo_tools/update_kernel_afdo` creates 5.4 data.

Change-Id: If43727dbaf0fd6409f043d5978795219b580fcb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2774636
Tested-by: Denis Nikitin <denik@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>
1 file changed