sama5d3: change the board folder name

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3: change the file name from at91sama5d3xek --> sama5d3xek

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3xek: as file name is changed, we need change CONFIG_BOARD as well

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3: as the board foler name is changed, need change CONFIG_BOARDNAME too

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3: change name in include/arch

Signed-off-by: Josh Wu <josh.wu@atmel.com>
sama5d3: change the macro definition name from AT91SAMA5D3 to SAMA5D3

Signed-off-by: Josh Wu <josh.wu@atmel.com>
update defconfig files for changing AT91SAMA5 to SAMA5

Signed-off-by: Josh Wu <josh.wu@atmel.com>