kernel: Make it clearer which kernels are compiled per arch
kernel: Make it clearer which kernels are compiled per arch

While this now has some duplication, it is clearer as to which
kernels are compiled for each architecture.

Signed-off-by: Rolf Neugebauer <6fdd1d8677ab4fbcb4df3eff6e190c3298f7f742@docker.com>

rn/linuxkit,justincormack/linuxkit,konstruktoid/linuxkit,YuPengZTE/linuxkit,djs55/linuxkit,furious-luke/linuxkit,JohnnyLeone/linuxkit,YuPengZTE/linuxkit,konstruktoid/linuxkit,furious-luke/linuxkit,JohnnyLeone/linuxkit,yankcrime/linuxkit,YuPengZTE/linuxkit,ndauten/linuxkit,deitch/linuxkit,rn/linuxkit,konstruktoid/linuxkit,justincormack/linuxkit,deitch/linuxkit,rn/linuxkit,djs55/linuxkit,djs55/linuxkit,ndauten/linuxkit,yankcrime/linuxkit,rn/linuxkit,linuxkit/linuxkit,ndauten/linuxkit,furious-luke/linuxkit,deitch/linuxkit,konstruktoid/linuxkit,linuxkit/linuxkit,linuxkit/linuxkit,yankcrime/linuxkit,ndauten/linuxkit,yankcrime/linuxkit,justincormack/linuxkit,deitch/linuxkit,justincormack/linuxkit,YuPengZTE/linuxkit,konstruktoid/linuxkit,yankcrime/linuxkit,konstruktoid/linuxkit,justincormack/linuxkit,deitch/linuxkit,JohnnyLeone/linuxkit,djs55/linuxkit,ndauten/linuxkit,justincormack/linuxkit,JohnnyLeone/linuxkit,rn/linuxkit,ndauten/linuxkit,yankcrime/linuxkit,linuxkit/linuxkit,YuPengZTE/linuxkit,JohnnyLeone/linuxkit,furious-luke/linuxkit,YuPengZTE/linuxkit,furious-luke/linuxkit,djs55/linuxkit,linuxkit/linuxkit