powerpc/4xx: Fix warp_gpio_leds build failure

The 44x/warp_defconfig build fails with:

  arch/powerpc/platforms/44x/warp.c:109:15: error: variable ‘warp_gpio_leds’ has initializer but incomplete type
    109 | static struct platform_device warp_gpio_leds = {
        |               ^~~~~~~~~~~~~~~

Fix it by including platform_device.h.

Fixes: ef175b2 ("of: Stop circularly including of_device.h and of_platform.h")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240305123410.3306253-3-mpe@ellerman.id.au

Author: mpe

arch/powerpc/platforms/44x/warp.c

@@ -8,6 +8,7 @@
 #include <linux/err.h>
 #include <linux/init.h>
 #include <linux/of_platform.h>
+#include <linux/platform_device.h>
 #include <linux/kthread.h>
 #include <linux/leds.h>
 #include <linux/i2c.h>