EXYNOS: add XXTI for clock source

Exynos SoC series are various and cover the different range of MCLK.
Several clock setting is based on MPLL, but it's to easy change depend on board configuration.
So, common setting of clock need for cover the various type of memory.
System clock (XXTI) is one of solution for it.

Signed-off-by: Jeong-Hyeon Kim <jhkim@insignal.co.kr>
1 file changed