Bluetooth: ATT: Rename op parameter of att_write_rsp
Bluetooth: ATT: Rename op parameter of att_write_rsp

This makes it clear that only request need to set an opcode since they
require a error response in case it fails.

Signed-off-by: Luiz Augusto von Dentz <8530c5ea66a1bdbc08f98bfcf183c8be901b5990@intel.com>

finikorg/zephyr,nashif/zephyr,nashif/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,punitvara/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,ldts/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,GiulianoFranchetto/zephyr,GiulianoFranchetto/zephyr,punitvara/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,punitvara/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,galak/zephyr,ldts/zephyr,Vudentz/zephyr,explora26/zephyr,ldts/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,Vudentz/zephyr,punitvara/zephyr,finikorg/zephyr,explora26/zephyr