ARM: imx: clk-imx6sx: register SSI/SSI_IPG as shared gate clocks

SSI and SSI_IPG are clocks controlled by the same clock gating field, so
register them with imx_clk_gate2_shared.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --cc arch/arm/mach-imx/clk-imx6sx.c
Simple merge