CHROMIUM: ARM: exynos: no duplicate mask/unmask in eint0_15

CHROMIUM: ARM: exynos: no duplicate mask/unmask in eint0_15

chained_irq_enter/exit() already mask&ack/unmask the chained interrupt.
There is no need to also explicitly do it in the handler.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
BUG=chrome-os-partner:13488
TEST=Manually verify.
TEST=ftrace shows only one call to
     combiner_{mask,unmask}_irq per call to exynos_irq_eint0_15

Change-Id: Id978cb4574af3ef1c6adccb1453ad2c51049e08b
Reviewed-on: https://gerrit.chromium.org/gerrit/32215
Reviewed-by: Doug Anderson <dianders@chromium.org>
Commit-Ready: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>