samples: video: capture: Fix floating point logging issue

The default frame rate is printed as a floating point number. Without
enabling CONFIG_REQUIRES_FLOAT_PRINTF, it is not printed at all. Fix it.

Signed-off-by: Phi Bang Nguyen <phibang.nguyen@nxp.com>

Author: ngphibang

samples/drivers/video/capture/prj.conf

@@ -5,3 +5,4 @@ CONFIG_DEVICE_SHELL=y
 CONFIG_PRINTK=y
 CONFIG_LOG=y
 CONFIG_DISPLAY=y
+CONFIG_REQUIRES_FLOAT_PRINTF=y