platform/surface: aggregator: fix a bit test

The "funcs" variable is a u64.  If "func" is more than 31 then the
BIT() shift will wrap instead of testing the high bits.

Fixes: c167b9c7 ("platform/surface: Add Surface Aggregator subsystem")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Link: https://lore.kernel.org/r/YH6UUhJhGk3mk13b@mwanda


Signed-off-by: Hans de Goede <hdegoede@redhat.com>