arch: riscv: irq: include util_macro.h for the macros

Macros like `BIT()` & `BIT64()` from the `util_macro.h` are
used, include their header to compile properly.

Signed-off-by: Yong Cong Sin <[email protected]>

Author: ycsin

include/zephyr/arch/riscv/irq.h

@@ -18,6 +18,8 @@
 extern "C" {
 #endif
 
+#include <zephyr/sys/util_macro.h>
+
 #ifndef _ASMLANGUAGE
 #include <zephyr/irq.h>
 #include <zephyr/sw_isr_table.h>