reset: add Tegra186 reset driver

In Tegra186, on-SoC reset signals are manipulated using IPC requests to
the BPMP (Boot and Power Management Processor). This change implements a
driver that does that. 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/reset/Makefile b/drivers/reset/Makefile
index 71f3b21..ff0e090 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -5,3 +5,4 @@
 obj-$(CONFIG_DM_RESET) += reset-uclass.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset.o
 obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o
+obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o