nissa/nereid: increase C1 charger interrupt priority
nissa/nereid: increase C1 charger interrupt priority

Drawcia uses the same general topology on USB-C where chargers and TCPCs
share an interrupt line, which was found to cause problems with
excessive interrupt latency and fixed in commit
e858299538e00490ccbab65e199307c455a7d1c8. This change does the same
prioritization for Nereid.

BUG=b:226669197
TEST=PD is no longer flaky on C1 with some partners sending hard resets
BRANCH=none

Change-Id: Ied32abc07f1b1c9b3c89130941f87cd469435630
Signed-off-by: Peter Marheine <ef0b2c492edde94778d7465bfbaeed52c5be6858@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3554376
Reviewed-by: Andrew McRae <44ad1424cfc8411c96d9181798ca41ae55709dfb@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec