ARM: i.MX27 clk: Add 26 MHz oscillator circuit clock gate

This patch adds missing 26 MHz oscillator circuit clock gate support.

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

diff --cc arch/arm/mach-imx/clk-imx27.c
Simple merge

diff --cc include/dt-bindings/clock/imx27-clock.h
Simple merge