[flash_ctrl] update flash_ctrl sanity target
[flash_ctrl] update flash_ctrl sanity target

- Need to use top level pwrmgr.
- Alternatively, update pwrmgr ip level example.

Signed-off-by: Timothy Chen <d7b2ae30d8c0f215facd721941273067fd1d14a2@google.com>

[flash_ctrl] typos

Signed-off-by: Timothy Chen <d7b2ae30d8c0f215facd721941273067fd1d14a2@google.com>

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