clock: add Tegra186 clock driver

In Tegra186, on-SoC clocks are manipulated using IPC requests to the BPMP
(Boot and Power Management Processor). This change implements a driver
that does that. A tegra/ sub-directory is created to follow the existing
pattern. It is unconditionally selected by CONFIG_TEGRA186 since virtually
any Tegra186 build of U-Boot will need the feature.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 6eee8eb..7dd5673 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -20,6 +20,7 @@
 	  setting up clocks within SPL, and allows the same drivers to be
 	  used as U-Boot proper.
 
+source "drivers/clk/tegra/Kconfig"
 source "drivers/clk/uniphier/Kconfig"
 source "drivers/clk/exynos/Kconfig"