Change lwkt_send_ipiq() and lwkt_wait_ipiq() to take a globaldata_t instead

Change lwkt_send_ipiq() and lwkt_wait_ipiq() to take a globaldata_t instead
of a cpuid.  This is part of an ongoing cleanup to use globaldata_t's to
reference other cpus rather then their cpu numbers, reducing the number of
serialized memory indirections required in a number of code paths and
making more context available to the target code.