riscv: hw: Remove duplicated "hw/hw.h" inclusion

Commit a27bd6c779ba ("Include hw/qdev-properties.h less") wrongly
added "hw/hw.h" to sifive_prci.c and sifive_test.c.

Another inclusion of "hw/hw.h" was later added via
commit 650d103d3ea9 ("Include hw/hw.h exactly where needed"), that
resulted in duplicated inclusion of "hw/hw.h".

Fixes: a27bd6c779ba ("Include hw/qdev-properties.h less")
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>

hw/riscv/sifive_prci.c

@@ -19,7 +19,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "hw/hw.h"
 #include "hw/sysbus.h"
 #include "qemu/module.h"
 #include "target/riscv/cpu.h"

hw/riscv/sifive_test.c

@@ -19,7 +19,6 @@
  */
 
 #include "qemu/osdep.h"
-#include "hw/hw.h"
 #include "hw/sysbus.h"
 #include "qemu/module.h"
 #include "sysemu/runstate.h"