In R-Car GPIO hardware block, 'chattering removal' feature can be
enabled on GPIO-n-[3:0] pins, but it's not supported on rest of pins
GPIO-n-[31:4].
Set an appropriate debounce interval, instead. We could confirm that
spurious/unnecessary GPIO interrupts are prevented by this settings.
Based on work for the lager board by Shinya Kuribayashi.
Cc: Shinya Kuribayashi <shinya.kuribayashi.px@renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
478e2f9ca5