it83xx/irq: there is no need to configure IER on nds32 core chip
it83xx/irq: there is no need to configure IER on nds32 core chip

Configure interrupt enable register is redundant on nds32 core chip
(IT8320). We just need to configure extended IER.

BRANCH=asurada, dedede
BUG=b:197308582
TEST=buildall passes, storo and hayato boot.

Signed-off-by: Dino Li <338d523ecf3700bd86eb9c34d220f91911d2a18c@ite.com.tw>
Change-Id: I8f99f7b937ac98d95b2f50f5be7b461ae3e9a413
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3134888
Reviewed-by: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>
Commit-Queue: Aseda Aboagye <12c9b286316a940fd31c24070da5ab64cdd4d0e7@chromium.org>

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