fix -Wsizeof-pointer-memaccess error while compiling with 4.8 toolchain

kernel/lge/msm8226/net/bluetooth/hci_conn.c:407:28: warning: argument to 'sizeof' in 'memcpy' call is the 
same pointer type '__u8 *' as the destination; expected '__u8' or an explicit length [-Wsizeof-pointer-memaccess]
error, forbidden warning: hci_conn.c:407
make[4]: *** [net/bluetooth/hci_conn.o] Error 1
make[3]: *** [net/bluetooth] Error 2


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above error is fix by above addition of -Wno-sizeof-pointer-memaccess in KBUILD_CFLAGS