[PATCHv2 0/4] ARM build infra changes to support building .dtbos

Hi,

This v2 is just a split of the v1 series, adding support for building
DT overlays to ARM build infra. The series also adds support for
individual Makefiles under boot/dts hierarchy, so that per-dir
flags or rules can be introduced (patch #2, #4.)

Depends on the kbuild change for adding support for building .dtbo files [1].

[1] https://marc.info/?l=linux-arm-kernel&m=153571933518229&w=2

-Tero

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