Comment 9 for bug 1766052

At least the images that generally get generated are raspi2 ones (so armhf) but since the modification is done in a shared part of the build scripts this is done for all kernels based on the bionic (4.15) tree. Looking at the raspi2 build:

wget https://launchpad.net/~canonical-kernel-team/+archive/ubuntu/ppa/+build/14930811/+files/linux-modules-4.15.0-1012-raspi2_4.15.0-1012.13_armhf.deb
dpkg -x linux-modules-4.15.0-1012-raspi2_4.15.0-1012.13_armhf.deb unpack
grep bcm unpack/lib/modprobe.d/blacklist_linux-raspi2_4.15.0-1012-raspi2.conf