RT77788. k70-som: Add support for the Emcraft K70-SOM + SOM-BSB platform
* Add Makefile target `k70-som_config`. * Start K70-SOM board support code by cloning off the TWR-K70F120M board-specific code. * Update DDR controller configuration to interact with the LPDDR memory chip. Update timings for a 120 MHz DDR clock. * Remove configuration of pins NFC_D8..NFC_D15, they are not used by 8-bit NAND flashes. * Optionally support 8-bit NAND flashes in the `fsl_nfc.c` driver. * Set correct size of RAM (64 MB). * Do not configure the LCD clock, because we do not support LCDs with K70-SOM yet. * Update U-Boot prompt, IP address, MAC address, bootargs, hostname.
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