common: Move enable/disable_interrupts out of common.h

Move these two functions into the irq_funcs.h header file. Also move
interrupt_handler_t as this is used by the irq_install_handler() function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

cmd/bootz.c

@@ -7,6 +7,7 @@
 #include <common.h>
 #include <bootm.h>
 #include <command.h>
+#include <irq_func.h>
 #include <lmb.h>
 #include <linux/compiler.h>