ARM: tegra: update GPIO chained IRQ handler to use entry/exit functions

This patch updates the Tegra gpio chained IRQ handler to use the chained
IRQ enter/exit functions in order to function correctly on primary
controllers with different methods of flow control.

This is required for the GIC to move to fasteoi interrupt handling.

Acked-by: Colin Cross <ccross@android.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>