librem5: Fix tps65982 IRQ configuration

Enable LVTTL and pull up since otherwise the level low IRQ is always
detected as firering.

Closes: #134

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
3 jobs for mrs/usb-c in 78 minutes and 6 seconds (queued for 1 minute and 31 seconds)
Status Job ID Name Coverage
  Build
passed #236457
librem5
build:aarch64

00:47:31

passed #236469
librem5
build:deb

00:30:35

failed #236458
librem5
build:deb

01:00:01