RFC: GSM flowcontrol handling, GTA01 and GTA02

[Andy Green]

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Somebody in the thread at some point said:

| in neo1973_pm_gsm.c.  All we really want is to leave the UART in
| auto-flowcontrol mode, but override the RTS line by switching it to GPIO
| mode.  A dozen lines of code in neo-specific source, versus some unknown
| amount of code with sweeping impact to all users of s3cx24xx devices? --
| I've switched from my original position to support the more practical
| solution :-)

Sounds good to me :-)

- -Andy
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