reset: Add STi reset support

This patch adds a reset controller implementation for STMicroelectronics
STi family SoCs; it allows a group of related reset like controls found
in multiple system configuration registers to be represented by a single
controller device.

Driver code has been mainly extracted from kernel
drivers/reset/sti/reset-stih407.c

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index c42b0bc..fa77ee4 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -20,6 +20,14 @@
 	  simply accepts requests to reset various HW modules without actually
 	  doing anything beyond a little error checking.
 
+config STI_RESET
+	bool "Enable the STi reset"
+	depends on ARCH_STI
+	help
+	  Support for reset controllers on STMicroelectronics STiH407 family SoCs.
+	  Say Y if you want to control reset signals provided by system config
+	  block.
+
 config TEGRA_CAR_RESET
 	bool "Enable Tegra CAR-based reset driver"
 	depends on TEGRA_CAR