meta-quanta: q71l: drop spictrl script

Drop the spimaster python script.  This script let one, via devmem
accesses, change the SPI control to let the BMC access the BIOS flash
chip.

OpenBMC is aiming to drop python support, and this script was only a
proof-of-concept.  If required, a linux driver should be written to
handle this.

(From meta-quanta rev: fa279684ea0fa59cd106c6955c92d2f9f539c3a0)

Change-Id: I74e4e62054b914013d230b834e882353eb70a67e
Signed-off-by: Patrick Venture <venture@google.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>