mb/google/poppy/variants/nocturne: fix FPMCU IRQ sensitivity

the FPMCU_INT_L on GPP_C11 is active low but the kernel irq handler is
defined as IRQF_TRIGGER_LOW, so do not invert it twice.

TEST=On Nocturne, the 'cros_ec' IRQ count in /proc/interrupts does not
increment wildly.

Change-Id: I56c13c797b133dd22669a2299bcd16ef14eed335
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-on: https://review.coreboot.org/27221
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
1 file changed