drivers/lcd and configs/olimex-lpc1766stk: Remove support for the Nokia6100...

drivers/lcd and configs/olimex-lpc1766stk:  Remove support for the Nokia6100 LCD.  That LCD uses a 9-bit SPI interface (the 9th bit being the command/data bit that is normally a discrete).  That communication was never successfully integrated.  I now believe that it would would require some special support from the low-level, MCU SPI driver to manage that 9th bit.  The deleted code is still available in the Obsoleted repository in the nuttx/drivers/lcd, nuttx/configs/olimex-lpc1766stk, and Patches directories.