event: Convert existing spy records to simple

Very few of the existing event-spy records use the arguments they are
passed. Update them to use a simple spy instead, to simplify the code.

Where an adaptor function is currently used, remove it where possible.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/riscv/include/asm/system.h b/arch/riscv/include/asm/system.h
index ffa7649..87a804b 100644
--- a/arch/riscv/include/asm/system.h
+++ b/arch/riscv/include/asm/system.h
@@ -26,6 +26,6 @@
     } while (0)
 
 /* Hook to set up the CPU (called from SPL too) */
-int riscv_cpu_setup(void *ctx, struct event *event);
+int riscv_cpu_setup(void);
 
 #endif	/* __ASM_RISCV_SYSTEM_H */