altoslib: Store MS5607 data in AltosConfigData for use by AltosMs5607

When doing 'Monitor Idle', we fetch new config data each iteration and
pass that to each of the readers, including ms5607. Instead of
re-fetching the config data there, just store the ms5607 parameters
when we fetch it the first time and copy it over.

Signed-off-by: Keith Packard <keithp@keithp.com>