Use build variants to cover all 11 hardware options [0]:
espressobin-512mb
espressobin-v3-v5-1gb-1cs
espressobin-v3-v5-1gb-1cs-emmc
espressobin-v3-v5-1gb-2cs
espressobin-v3-v5-1gb-2cs-emmc
espressobin-v3-v5-2gb
espressobin-v3-v5-2gb-emmc
espressobin-v7-1gb
espressobin-v7-1gb-emmc
espressobin-v7-2gb
espressobin-v7-2gb-emmc
CLOCKSPRESET is set to CPU_800_DDR_800 for all builds, which is the only
stable configuration. That actually matches what Globalscale shipped as
CPU_1000_DDR_800 combined with kernel versions < v4.19.42. [1][2].
Signed-off-by: Andre Heider <a.heider@gmail.com>