Changes for omap1 variants for v4.21 merge window

In this set of changes Aaro Koskinen revives Palm Tungsten E for the
MMC and USB making it usable again. And Janusz Krzysztofik follows up
on the clean-up of  ams-delta GPIO handling. The other changes are
clean-up for DEFINE_SHOW_ATTRIBUTE by Yangtao Li.
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