spi: mpc52xx: explicitly include linux/platform_device.h

Since linux/of_platform.h had included linux/platform_device.h
and since that inclusion was removed, this driver now needs to include
the latter header file explicitly to prevent build errors:

drivers/spi/spi-mpc52xx.c: In function 'mpc52xx_spi_probe':
drivers/spi/spi-mpc52xx.c:396:20: error: invalid use of undefined type 'struct platform_device'

and more like that.

Fixes: 0d18bcd ("of: Stop circularly including of_device.h and of_platform.h")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: rddunlap

drivers/spi/spi-mpc52xx.c

@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
+#include <linux/platform_device.h>
 
 #include <asm/time.h>
 #include <asm/mpc52xx.h>