drivers: dma: Add support for cc23x0 DMA

Add support for 8-channel configurable DMA controller. The driver
supports the following features:
- memory to peripheral (ch0 to ch5)
- peripheral to memory (ch0 to ch5)
- memory to memory (ch6 and ch7)

Each DMA channel is multiplexed between two or more trigger sources:
- ch0 -> SPI0_TX or UART0_RX
- ch1 -> SPI0_RX or UART0_TX
- ch2 -> LRFD or UART0_TX
- ch3 -> ADC0 or UART0_RX
- ch4 -> AES_A or LRFD
- ch5 -> AES_B or ADC0
- ch6 -> Software Event Channel 0
- ch7 -> Software Event Channel 1

Signed-off-by: Julien Panis <jpanis@baylibre.com>