media: fimc-is-sysfs: silence Wsizeof-array-div

drivers/media/platform/exynos/fimc-is2/vendor/mcd/fimc-is-sysfs.c:248:40: error: expression does not compute the number of elements in this arr
ay; element type is 'struct ssrm_camera_data', not 'int' [-Werror,-Wsizeof-array-div]
        if (ret_count > sizeof(SsrmCameraInfo)/sizeof(int))

Change-Id: I2f3b33c7c1951cfa316a9cc59d87308564ffbd93