ARM: dts: imx51-babbage: Move "hog" pins into corresponded pin groups

Move "hog" pins into corresponded pin groups for eSDHC1, eSDHC2,
eCSPI1, gpio-keys, regulator-fixed and codec clock.
Additionally, this patch fixes GPIO active level definition for
USB regulator.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>