This doesn't seem very useful to trace before the recursion check, even
if the ftrace code has any recursion checks of its own. Be on the safe
side and don't trace the hcall trace wrappers.

Reported-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210508101455.1578318-3-npiggin@gmail.com