Rename the imx/ directories to imx1/ to make room in the namespace for other members of the i.MX family

SAME70: The nomimal frequency of the slow RC oscillator is 32KHz, not 32.768 KHz which has too much false implied accuracy

SAMV71 and SAME70 board:  In sam_appinit.c, need to include sys/types. hf CONFIG_BOARD_INITIAILZE is not defineed.  Noted by Matt Poppe.