target/xtensa: fix pasto in pfwait.r opcode name

Core xtensa opcode table has pfwait.o instead of pfwait.r. Fix that.

Fixes: c884400f2988 ("target/xtensa: implement block prefetch option opcodes")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
1 file changed