Bluetooth: btintel_pcie: Avoid redundant buffer allocation

Reuse the skb buffer provided by the PCIe driver to pass it onto the
stack, instead of copying it to a new skb.

Fixes: c2b636b3 ("Bluetooth: btintel_pcie: Add support for PCIe transport")
Signed-off-by: Kiran K <kiran.k@intel.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>