commonlib/device_tree.c: Add read reg property helper

Add a helper function to read the reg property from an unflattened
device tree.
It also factors out the common code into a new function called
`read_reg_prop`.

Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: I7846eb8af390d709b0757262025cb819e9988699
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83457
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

0 files changed, 0 insertions, 0 deletions