NFC: st21nfca: Remove double assignment of .owner in struct device_driver

The .owner member of struct device_driver is assigned THIS_MODULE twice.

Introduced by:

commit c44cb2ed
("NFC: dts: st21nfca: Add device-tree (Open Firmware) support to st21nfca")

Acked-by: Christophe RICARD <christophe-h.ricard@st.com>
Signed-off-by: Emil Goode <emilgoode@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>