Rp2 debug

[hemonu]

Fix for lcd_bus to make it available for rp2 port:

I have tested it for an ili9341 display with xpt2046 touch via SPI and
an ili9486 display without touch via 16 bit i80 bus.

Main changes:

micropy_updates/common/mp_spi_common.h:
Separate definition for bus/device for ESP32 port and common (other) ports to make it compatible with machine_spi.c in micropy_updates/rp2

ext_mod/lcd_bus/common_include/spi_bus.h and i80_bus.h:
buffer_flags in struct definition, as otherwise the pointers are no more aligned

ext_mod/lcd_bus/common_src/spi_bus.c:
as a spi device is already given to the constructor for the creation of the mp_lcd_spi_bus_obj, I have eliminated that from the
s_spi_init function and use the already existing bus.
Workaround for the different naming for the SPI device inside machine_spi.c and this file

ext_mod/lcd_bus_common_src/i80_bus.c:
NULL pointer in the code for CMD sending eliminated
code for parameter sending corrected for all 4 possible combinations of parameter_bits and bus_width

I tried to compile also for STM32, but it first failed because "LV_USE_TINY_TTF" was redefined. When I corrected that I got many errors like this:

build-STM32F439/lv_mpy.c:36775:17: error: 'mp_lv_funcptr_lv_iter_next_cb' defined but not used [-Werror=unused-function]
36775 | static mp_obj_t mp_lv_funcptr_lv_iter_next_cb(void *func){ return mp_lv_funcptr(&mp_funcptr_lv_iter_next_cb_mpobj, func, NULL, MP_QSTR_, NULL); }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~

So I gave up. But at least the bitbang i80_bus should work for stm32 too.