sh: extend INTC with force_enable

Extend the shared INTC code with force_enable support to
allow keeping mask bits statically enabled. Needed by
upcoming INTC SDHI patches that mux together a bunch of
vectors to a single linux interrupt which is masked by
a priority register, but needs individual mask bits
constantly enabled.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/linux/sh_intc.h

@@ -71,6 +71,7 @@ struct intc_hw_desc {
 
 struct intc_desc {
 	char *name;
+	intc_enum force_enable;
 	struct intc_hw_desc hw;
 };