[PATCH v1] spi: spi-ppc4xx: include missing platform_device.h

[Christian Lamparter <chunkeey@gmail.com>]

the driver currently fails to compile on 6.8-rc3 due to:
| spi-ppc4xx.c: In function ‘spi_ppc4xx_of_probe’:
| @346:36: error: invalid use of undefined type ‘struct platform_device’
| 346 |         struct device_node *np = op->dev.of_node;
|     |                                    ^~
| ... (more similar errors)

it was working with 6.7. Looks like it only needed the include
and its compiling fine!

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
---
 drivers/spi/spi-ppc4xx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c
index 03aab661be9d..412d6e678224 100644
--- a/drivers/spi/spi-ppc4xx.c
+++ b/drivers/spi/spi-ppc4xx.c
@@ -25,6 +25,7 @@
 #include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/wait.h>
+#include <linux/platform_device.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
-- 
2.43.0