ARM: imx: clk-vf610: fix FlexCAN clock gating

Extend the clock control for FlexCAN with the second gate which
enable the clocks in the Clock Divider (CCM_CSCDR2) register too.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --cc arch/arm/mach-imx/clk-vf610.c
Simple merge

diff --cc include/dt-bindings/clock/vf610-clock.h
Simple merge