rcu: Remove UINT_CMP_GE() and UINT_CMP_LT()

The UINT_CMP_GE() and UINT_CMP_LT() macros are not used, so this
commit removes them.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>