riscv: cacheinfo: Adjust includes to remove of_device.h

Now that of_cpu_device_node_get() is defined in of.h, of_device.h is just
implicitly including other includes, and is no longer needed. Adjust the
include files with what was implicitly included by of_device.h (cpu.h and
of.h) and drop including of_device.h.

Link: https://lore.kernel.org/r/20230329-dt-cpu-header-cleanups-v1-9-581e2605fe47@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>

arch/riscv/kernel/cacheinfo.c

@@ -5,7 +5,6 @@
 
 #include <linux/cpu.h>
 #include <linux/of.h>
-#include <linux/of_device.h>
 #include <asm/cacheinfo.h>
 
 static struct riscv_cacheinfo_ops *rv_cache_ops;