dt-bindings: i2c: at91: cosmetic formatting of compatible list

Format the list of compatibles with one compatible per line.
Suggested-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

Documentation/devicetree/bindings/i2c/i2c-at91.txt

 I2C for Atmel platforms
 
 Required properties :
-- compatible : Must be "atmel,at91rm9200-i2c", "atmel,at91sam9261-i2c",
-     "atmel,at91sam9260-i2c", "atmel,at91sam9g20-i2c", "atmel,at91sam9g10-i2c",
-     "atmel,at91sam9x5-i2c", "atmel,sama5d4-i2c", "atmel,sama5d2-i2c" or
-     "microchip,sam9x60-i2c"
+- compatible : Must be one of:
+	"atmel,at91rm9200-i2c",
+	"atmel,at91sam9261-i2c",
+	"atmel,at91sam9260-i2c",
+	"atmel,at91sam9g20-i2c",
+	"atmel,at91sam9g10-i2c",
+	"atmel,at91sam9x5-i2c",
+	"atmel,sama5d4-i2c",
+	"atmel,sama5d2-i2c",
+	"microchip,sam9x60-i2c".
 - reg: physical base address of the controller and length of memory mapped
      region.
 - interrupts: interrupt number to the cpu.