Six files in the osa/ directory.

Yes, I added FreeRTOS
I did not add osa/ before using the ConfigTools. Everything was done through
that interface.
I added:
Operating Systems:
FreeRTOS kernel
Drivers:
adc
clock
common
ctimer
dma
dmic
dmic_dma
flexcomm
flexcomm_i2s
flexcomm_i2s_dma
gpio
i2c
i2c_dma
i2c_freertos
iocon
power
reset
sdif
spi
spi_dma
spi_freertos
usart
usart_dma
usart_freertos
CMS Include:
CMSIS_Include_CM
LPC54606_CMSIS
LPC54606_system
Utilities:
assert
debug_console
serial_manager
usart_adapter
Middleware:
File System
FAT File System
fatfs
mmc
ram
sd
usb
Memories
SDMMC Stack
mmc
sd
sdmmc_host_sdif_interrupt
sdmmc_osa_bm