ARM: keystone: Drop unused includes

Several includes are not needed, so drop them.

of_platform.h is not needed, but it implicitly includes platform_device.h
(for now) which is needed.
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230717225610.3214029-1-robh@kernel.orgSigned-off-by: Nishanth Menon <nm@ti.com>

arch/arm/mach-keystone/keystone.c

@@ -7,12 +7,10 @@
  *	Santosh Shilimkar <santosh.shillimkar@ti.com>
  */
 #include <linux/io.h>
-#include <linux/of.h>
 #include <linux/dma-map-ops.h>
 #include <linux/init.h>
-#include <linux/of_platform.h>
-#include <linux/of_address.h>
 #include <linux/memblock.h>
+#include <linux/platform_device.h>
 
 #include <asm/setup.h>
 #include <asm/mach/map.h>