fix the FPS caculation error for HEVC encoder
fix the FPS caculation error for HEVC encoder

Signed-off-by: peng.chen <8e45e30bcd1351ba192acc6125a4df020f8d621c@intel.com>

uartie/vaapi-intel-driver,01org/iotg-lin-gfx-va-driver,uartie/vaapi-intel-driver,01org/iotg-lin-gfx-va-driver,uartie/vaapi-intel-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,01org/iotg-lin-gfx-va-driver,uartie/vaapi-intel-driver,uartie/vaapi-intel-driver