NFC: Fix warning "warning: incorrect type in assignment"

Fix warnings:
net/nfc/llcp_commands.c:421:14: warning: incorrect type in assignment (different base types)
net/nfc/llcp_commands.c:421:14:    expected unsigned short [unsigned] [usertype] miux
net/nfc/llcp_commands.c:421:14:    got restricted __be16
net/nfc/llcp_commands.c:477:14: warning: incorrect type in assignment (different base types)
net/nfc/llcp_commands.c:477:14:    expected unsigned short [unsigned] [usertype] miux
net/nfc/llcp_commands.c:477:14:    got restricted __be16

Procedure to reproduce:
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>