For the parallel interface support the following changes were made:
1. Additional `lcd_*` pseudomodules are defined to control whether SPI serial or MCU 8080 8-/16-bit parallel interface is used.
2. The low level function implementation was extended for parallel interfaces so that the now can use either the SPI serial interface or the MCU 8080 8-/16-bit parallel interface.
Using the `lcc_*` modules, either the SPI serial interface or the MCU 8080 8-/16-bit interface or even both for multiple display can be used simultaneously.
