Kinetis Ethernet fix, add FTM3

Approved-by: Gregory Nutt

  This defined the RMII clock source select bits and allows
  the selection to be made via Kconfig

procfs:  Most stat() implementations were not initializating the st_atime, st_ctime, and st_mtime fields.

fstat(): Rethink procfs fstat().  If write method is supported, then should report file s writeable.

LPC43:  Rename HAVE_CONSOLE to HAVE_SERIAL_CONSOLE.  We can, of course, always have a some console other than a serial console.

LPC43 serial:  Correct conditional logi that selects /dev/ttySN.  Problem noted by Alan Carvalho de Assis.

Upstream kinetis

Approved-by: Gregory Nutt

   Update Console to match README.txt

procfs: When addition of memset from previous commit, it is no longer necessary to set individual fields to zero.

Upstream kinetis

Approved-by: Gregory Nutt

  Added K66 FMC register definition

   Added ALT version of RNGA, FTM2, DAC0 as a facility to later
   define secondary access via AIPS1 to these peripherals