power: bq25890_charger: temperature is also an adc value

Make sure that a conversion has happened so the temperature is valid.

fixes #366

Signed-off-by: Angus Ainslie <angus@akkea.ca>
2 jobs for bq25890-85C in 67 minutes and 30 seconds (queued for 1 second)
latest
Status Name Job ID Coverage
  Build
passed build:aarch64 #375965
librem5

00:16:04

passed build:deb #375966
librem5:arm64

01:07:30