ARM: shmobile: r8a7740 legacy: Add missing INTCA clock for irqpin module

ARM: shmobile: r8a7740 legacy: Add missing INTCA clock for irqpin module

This clock drives the irqpin controller modules.
Before, it was assumed enabled by the bootloader or reset state.
By making it available to the driver, we make sure it gets enabled when
needed, and allow it to be managed by system or runtime PM.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 85eb968e84686faa507daa3c5cfdfbfefc7eda95)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>