CHROMIUM: media: camx: remove unused hdl variable

Suppress warning (reported by Stephen):
hw_utils/cam_isp_packet_parser.c:490:38: warning: variable 'hdl' set but not used

UPSTREAM-TASK=b:274966069
BUG=none
TEST=compile tested

Change-Id: I6c95d49b392768ac38858bada41ed9c655729390
Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5904570


Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Mateusz Urbańczyk <urbanczyk@google.com>