First set of fixes for IIO in the 5.14 cycle

adi,adis:
 - Ensure GPIO pin direction set explicitly in driver.
fxls8952af:
 - Fix use of ret when not initialized.
 - Fix issue with use of module symbol from built in.
hdc100x:
 - Add a margin to conversion time as some parts run to slowly.
palmas-adc:
 - Fix a wrong exit condition that leads to adc period always being set
   to maximum value.
st,sensors:
 - Drop a wrong restriction on number of interrupts in dt binding.
ti-ads7950:
 - Ensure CS deasserted after channel read.
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