boards: particle_*: fix antenna initialization

The GPIO drivers are initialized in the POST_KERNEL level with the
default priority, so whether they're available at the time the sysinit
function requires them depends on how the linker orders the init
records.  Since we can't set a priority relative to the default
priority, hard-code the maximum priority and hope it's good enough.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
3 files changed