drm/vkms: change min cursor size to accept smaller values

Change min cursor size of vkms driver from 20 to 10, to increase the IGT
test coverage of vkms by enabling 32x10 cursor size subtests in
kms_cursor_crc
Signed-off-by: Alaa Emad <aemad@igalia.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Melissa Wen <melissa.srw@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221109113945.20938-1-aemad@igalia.com

drivers/gpu/drm/vkms/vkms_drv.h

@@ -12,8 +12,8 @@
 #include <drm/drm_encoder.h>
 #include <drm/drm_writeback.h>
 
-#define XRES_MIN    20
-#define YRES_MIN    20
+#define XRES_MIN    10
+#define YRES_MIN    10
 
 #define XRES_DEF  1024
 #define YRES_DEF   768