download_from_ci: Fix build->build/kernel breakage

This was broken because the script is now moved due
to overall move of build/* -> build/kernel/*

Old: <ACK_ROOT>/build/gki/download_from_ci
New: <ACK_ROOT>/build/kernel/gki/download_from_ci

Bug: 204425264
Test: manually run to success from ACK
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
Change-Id: I7fd80c04635058240fe5c1ded0497a37b72c25f8
1 file changed