media: rockchip vpu: remove some unused vars

media: rockchip vpu: remove some unused vars

As complained by gcc:

	drivers/staging/media/rockchip/vpu/rk3288_vpu_hw_jpeg_enc.c: In function 'rk3288_vpu_jpeg_enc_set_qtable':
	drivers/staging/media/rockchip/vpu/rk3288_vpu_hw_jpeg_enc.c:70:10: warning: variable 'chroma_qtable_p' set but not used [-Wunused-but-set-variable]
	  __be32 *chroma_qtable_p;
	          ^~~~~~~~~~~~~~~
	drivers/staging/media/rockchip/vpu/rk3288_vpu_hw_jpeg_enc.c:69:10: warning: variable 'luma_qtable_p' set but not used [-Wunused-but-set-variable]
	  __be32 *luma_qtable_p;
	          ^~~~~~~~~~~~~
	drivers/staging/media/rockchip/vpu/rk3399_vpu_hw_jpeg_enc.c: In function 'rk3399_vpu_jpeg_enc_set_qtable':
	drivers/staging/media/rockchip/vpu/rk3399_vpu_hw_jpeg_enc.c:101:10: warning: variable 'chroma_qtable_p' set but not used [-Wunused-but-set-variable]
	  __be32 *chroma_qtable_p;
	          ^~~~~~~~~~~~~~~
	drivers/staging/media/rockchip/vpu/rk3399_vpu_hw_jpeg_enc.c:100:10: warning: variable 'luma_qtable_p' set but not used [-Wunused-but-set-variable]
	  __be32 *luma_qtable_p;
	          ^~~~~~~~~~~~~
	drivers/staging/media/rockchip/vpu/rockchip_vpu_enc.c: In function 'rockchip_vpu_queue_setup':
	drivers/staging/media/rockchip/vpu/rockchip_vpu_enc.c:522:33: warning: variable 'vpu_fmt' set but not used [-Wunused-but-set-variable]
	  const struct rockchip_vpu_fmt *vpu_fmt;
	                                 ^~~~~~~
	drivers/staging/media/rockchip/vpu/rockchip_vpu_enc.c: In function 'rockchip_vpu_buf_prepare':
	drivers/staging/media/rockchip/vpu/rockchip_vpu_enc.c:560:33: warning: variable 'vpu_fmt' set but not used [-Wunused-but-set-variable]
	  const struct rockchip_vpu_fmt *vpu_fmt;
	                                 ^~~~~~~

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>