fix buffer overflow for dc_values and ac_values (v2)
fix buffer overflow for dc_values and ac_values (v2)

The dc_values only have 12 bytes and ac_value only 162 bytes but the
memcpy did it for 16 bytes and 256 bytes copying thru hard code value.
To avoid the array index out of bound again, recommend move to use sizeof.

v2:
Fix commit message typo from 265 bytes to 256 bytes.

Signed-off-by: Lim Siew Hoon <e412356d7e67dbdde94e841e5d46937fb9f4e623@intel.com>

01org/libva-cros,01org/iotg-lin-gfx-libva,01org/libva-cros,01org/iotg-lin-gfx-libva,01org/libva-cros,01org/iotg-lin-gfx-libva