linux-phytec-fsl

ARM: dts: i.MX27: Remove optional "ptp" clock source for FEC

Patch removes optional "ptp" clock source for FEC. This clock is
missing in i.MX27.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>