The DragonBoard 410c is mainly supported by the ARM64 architecture
and defconfig, but it can also run well on the ARM32 architecture.
Add the necessary options to the multi_v7_defconfig to simplify
building an ARM32 kernel for DragonBoard 410c.

This is also a possible opportunity to slightly increase CI coverage
for older Qualcomm-based ARM32 platforms that are currently not
represented well in automated CI setups. The APQ8016 SoC used in DB410c
is still quite similar to those. DB410c is already used in some CI systems
so the same hardware could be re-used to get some basic ARM32 boot testing.

When deciding between built-in (y) and module (m), I usually used the
same that is already being used (and functional) in the ARM64 defconfig.
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211213113250.4249-2-stephan@gerhold.net