clk: meson: meson8b: add the CPU clock post divider clocks

There are four CPU clock post dividers:
- ABP
- PERIPH (used for the ARM global timer and ARM TWD timer)
- AXI
- L2 DRAM

Each of these clocks consists of two clocks:
- a mux to select between "cpu_clk" divided by 2, 3, 4, 5, 6, 7 or 8
- a "_clk_dis" gate. The public S805 datasheet states that this should
  be set to 1 to disable the clock, the default value is 0. There is
  also a hint that these are "just in case" bits which only exist in
  case the corresponding mux implementation does not allow glitch-free
  parent changes (the muxes are designed in a way that the clock can
  stay enabled when changing the mux). It's still good practise to
  describe this clock even if we're not supposed to modify it. Thus
  this uses the read-only gate ops.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lkml.kernel.org/r/20181122214017.25643-5-martin.blumenstingl@googlemail.com

drivers/clk/meson/meson8b.h

@@ -78,8 +78,19 @@
 #define CLKID_PLL_FIXED_DCO	113
 #define CLKID_PLL_VID_DCO	114
 #define CLKID_PLL_SYS_DCO	115
+#define CLKID_CPU_CLK_DIV2	116
+#define CLKID_CPU_CLK_DIV3	117
+#define CLKID_CPU_CLK_DIV4	118
+#define CLKID_CPU_CLK_DIV5	119
+#define CLKID_CPU_CLK_DIV6	120
+#define CLKID_CPU_CLK_DIV7	121
+#define CLKID_CPU_CLK_DIV8	122
+#define CLKID_ABP_SEL		123
+#define CLKID_PERIPH_SEL	125
+#define CLKID_AXI_SEL		127
+#define CLKID_L2_DRAM_SEL	129
 
-#define CLK_NR_CLKS		116
+#define CLK_NR_CLKS		131
 
 /*
  * include the CLKID and RESETID that have