ARM: imx6sl: add BYPASS support for PLL clocks

This is the same change for imx6sl clock driver as "ARM: imx6q: add BYPASS
support for PLL clocks" for imx6q.  The difference is that only anaclk1
is available on imx6sl.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --cc arch/arm/mach-imx/clk-imx6sl.c
Simple merge

diff --cc include/dt-bindings/clock/imx6sl-clock.h
Simple merge