ARM: dts: omap4-droid4: Fix interrupt triggering for cpcap

The CPCAP PMIC interrupt is level high sensitive despite it being
requested as edge high triggered in the Motorola Linux kernel.

Note that also the related driver change is needed posted as
"mfd: cpcap: Fix interrupt to use level interrupt".

Fixes: 56e1d40d ("mfd: cpcap: Add minimal support")
Cc: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Cc: Marcel Partap <mpartap@gmx.net>
Cc: Michael Scott <michael.scott@linaro.org>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>