Disallowing draining until bricking

[Andy Green]

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Somebody in the thread at some point said:

| I've been hoping someone else would mention this, but since nobody has,
| I guess I'll have to:
|
| What about the GSM?
|
| We can't power it off from the kernel.

Well we have two different ways to turn it off, U1705 is a MOSFET switch
to control if GSM logic can have battery power on VBAT net, it's
controlled by PMU GPIO 2.  Only the Power Amplifier U201 has a separate
connection to the battery, but its enable is controlled by the GSM logic
side and sits low when that is depowered (checked it myself recently).

Secondly there is logical "on switch" called PWON on U1002, it's driven
by NPN transistor Q1000 which in turn is controlled by CPU GPIO GPB7.

So I think it is OK.

- -Andy
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