HiKey/HiKey960: Migrate setprop calls to PRODUCT_PRODUCT_PROPERTIES

We recently added a workaround for for an adb/ffs crash:
  https://android-review.googlesource.com/c/device/linaro/hikey/+/930268

Which due to other changes is no longer sticking. Using
PRODUCT_PRODUCT_PROPERTIES is the preferred way to set properties
so switch to code to do that.

Change-Id: I330131f29c51acc6027885300bce5346053c94ca
Signed-off-by: John Stultz <john.stultz@linaro.org>
2 files changed