ARM: 5986/1: at91sam9g20-ek: Correct braces in I2C registration code

The change introduced in patch 5596/1 used incorrect bracing which
resulted in the AT24 EEPROM no longer being registered.  This patch
corrects the bracing and allows both the WM8731 audio device and AT24
EEPROM device to be registered.

Signed-off-by: Rob Alley <rob.alley@navmanwireless.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>