msm: charm: Wait for status to go low in panic handler
When a panic occurs in the kernel, the external modem
responds and goes through its own shutdown process.
Wait until the external modem gives a signal that
it has finished shutting down (dropping MDM2AP_STATUS)
before exiting the panic handler.
CRs-Fixed: 303416
Signed-off-by:
Laura Abbott <lauraa@codeaurora.org>
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