[media] fix coccinelle warnings

drivers/staging/media/bcm2048/radio-bcm2048.c:2632:1-7: Replace memcpy with struct assignment
/c/kernel-tests/src/cocci/drivers/staging/media/bcm2048/radio-bcm2048.c:744:1-7: Replace memcpy with struct assignment
/c/kernel-tests/src/cocci/drivers/staging/media/bcm2048/radio-bcm2048.c:2360:3-9: Replace memcpy with struct assignment

Generated by: coccinelle/misc/memcpy-assign.cocci

CC: Hans Verkuil <hans.verkuil@cisco.com>
CC: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>