am335x: IIO/ADC fixes if used together with TSC, v2

[Sebastian Andrzej Siewior]

The two bigger issues here are fixed by the last patch incuding
- time outs on the iio/adc side while TSC&ADC is used together
- a lockup issue which occurs while TSC&ADC is used together.

v1âv2:
 - spelled checked and re-read each commit message and formated to
   subject line as Lee suggested.
 - removed am335x_tsc_se_set(), replaced am335x_tsc_se_tsc_set() by 
   am335x_tsc_se_set_cache() and adc variant is now named
   am335x_tsc_se_set_once()
 - Added Lee Jones' tags

Sebastian                                                            
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