riscv: Add headers for asm/global_data.h

This header depended on bd_t and ulong, but did not include the appropriate
headers.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h
index 6c50149..2eb1481 100644
--- a/arch/riscv/include/asm/global_data.h
+++ b/arch/riscv/include/asm/global_data.h
@@ -11,6 +11,8 @@
 #define __ASM_GBL_DATA_H
 
 #include <asm/smp.h>
+#include <asm/u-boot.h>
+#include <compiler.h>
 
 /* Architecture-specific global data */
 struct arch_global_data {