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>

common/bootm.c

@@ -11,6 +11,7 @@
 #include <env.h>
 #include <errno.h>
 #include <fdt_support.h>
+#include <irq_func.h>
 #include <lmb.h>
 #include <malloc.h>
 #include <mapmem.h>