UPSTREAM: clk: rockchip: allow varying mux parameters for cpuclk pll-sources

UPSTREAM: clk: rockchip: allow varying mux parameters for cpuclk pll-sources

Thers are only two parent PLLs that APLL and GPLL for core on the
previous SoCs (RK3066/RK3188/RK3288/RK3368). Hence, we set fixed
GPLL as alternate parent when core is switching freq.

Since RK3399 big.LITTLE architecture, we need to select and adapt
more PLLs (ALPLL/ABPLL/DPLL/GPLL) sources.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
(cherry picked from git.kernel.org mmind/linux-rockchip.git v4.7-clk/next
 commit 0fda2be634398f4b8d53c0436311f99557e56c4e)

Conflicts:

	drivers/clk/rockchip/clk-rk3228.c
[zx: there is no rk3228 clock controller, apply this patch for
clk-rk3366.]

Change-Id: I48fde9facccd41585873c997b0b02a7a73972717