irqchip/gic-v3: Fix comment typo

The double `the' is duplicated in line 1786, remove one.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220715051258.28889-1-wangborong@cdjrlc.com