* Add Makefile target `lpc1850-eval_config`.
 * Set the system prompt to `LPC1850-EVAL> `.
 * Change CONFIG_MEM_NVM_LEN from 128 KBytes to 96 KBytes to match the
size of the largest continuous region of internal SRAM on LPC1850.
 * Adjust clock configuration for the 180MHz maximum core clock rate on
LPC1850: set the PLL1 multiplier value to 15.
 * Adjust SDRAM timings for the 180MHz maximum core clock rate on
LPC1850.
 * Adjust NOR flash timings for the 180MHz maximum core clock rate on
LPC1850.
 * Change default MAC address and IP address of the board defined in the
U-Boot environment.