drm/ssd130x: Use bool for ssd130x_deviceinfo flags

The .need_pwm and .need_chargepump fields in struct ssd130x_deviceinfo
are flags that can have only two possible values: 0 and 1.
Reduce kernel size by changing their types from int to bool.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/285005ff361969eff001386c5f97990f0e703838.1692888745.git.geert@linux-m68k.org

drivers/gpu/drm/solomon/ssd130x.h

@@ -40,8 +40,8 @@ struct ssd130x_deviceinfo {
 	u32 default_width;
 	u32 default_height;
 	u32 page_height;
-	int need_pwm;
-	int need_chargepump;
+	bool need_pwm;
+	bool need_chargepump;
 	bool page_mode_only;
 };