sh: extend INTC with force_disable

Extend the shared INTC code with force_disable support to
allow keeping mask bits statically disabled. Needed for
SDHI support to mask out unsupported interrupt sources.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/sh/intc.c b/drivers/sh/intc.c
index 66594eb..1da1ede 100644
--- a/drivers/sh/intc.c
+++ b/drivers/sh/intc.c
@@ -851,6 +851,9 @@
 		d->chip.mask_ack = intc_mask_ack;
 	}
 
+	/* disable bits matching force_disable before registering irqs */
+	if (desc->force_disable)
+		intc_enable_disable_enum(desc, d, desc->force_disable, 0);
 
 	/* disable bits matching force_enable before registering irqs */
 	if (desc->force_enable)