[AVR32] Wire up the SysV IPC calls properly

Wire up the individual sysvipc system calls and remove sys_ipc.
Strictly speaking, this breaks the ABI, but since sys_ipc never
worked anyway due to a silly bug, it isn't actually a regression.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

diff --cc arch/avr32/kernel/syscall_table.S
Simple merge

diff --cc include/asm-avr32/unistd.h
Simple merge