hikey960: flash-all: Make sure to format cache partition

We are re-using the cache partition as /metadata, so make
sure we format it when flashing to avoid quirks due to
outdated data left behind on the metadata parititon.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: I03d254785f9f8d3fde49b0dc3e19e22c542fd0ea
2 files changed