SAMA5 EMAC:  Create a empty, skeleton file that will eventually become the SAMA5 EMAC driver
SAMA5:  Update Ethernet initalization logic to handle both EMAC and GMAC
Prep for release 6.30
Back out part of a recent, incorrect ROMFS change
Merge branch 'nuttx'
Remove duplicate definition.

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>