tpm: atmel: Add explicit include for of.h

With linux/acpi.h (in linux/tpm.h) no longer implicitly including of.h,
add an explicit include of of.h to fix the following errors:

drivers/char/tpm/tpm_atmel.h:50:14: error: implicit declaration of function 'of_find_node_by_name'; did you mean 'bus_find_device_by_name'? [-Werror=implicit-function-declaration]
drivers/char/tpm/tpm_atmel.h:50:12: error: assignment to 'struct device_node *' from 'int' makes pointer from integer without a cast [-Werror=int-conversion]
drivers/char/tpm/tpm_atmel.h:55:14: error: implicit declaration of function 'of_device_is_compatible'; did you mean 'fwnode_device_is_compatible'? [-Werror=implicit-function-declaration]
...

Reported-by: Stephen Rothwell <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/char/tpm/tpm_atmel.h

···
 
 #ifdef CONFIG_PPC64
 
-#include <asm/prom.h>
+#include <linux/of.h>
 
 #define atmel_getb(priv, offset) readb(priv->iobase + offset)
 #define atmel_putb(val, priv, offset) writeb(val, priv->iobase + offset)