Make sure the LDO is always powered up, so the CP2105 internal and
external !RESET pull-ups are towards an active VIO voltage, rather than
one that is switched off by !SUSPEND and thus keeps the CP2105 in reset.
Closes: #1870 (https://osmocom.org/issues/1870)
The current 100uF caps are too high at 2.9mm. They touch the shielding
can of Quectel EC-20 modules, for exampel. Let's use 1206 packaged
versions at 1.6mm instead. Also, add two more, for safety.