sysreset: Add Atmel/Microchip sysreset driver

This patch adds a sysreset driver for Atmel/Microchip platforms.

Signed-off-by: Sergiu Moga <sergiu.moga@microchip.com>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 8e00be0..0ed3bbf 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -20,5 +20,6 @@
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
 obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o
+obj-$(CONFIG_SYSRESET_$(SPL_TPL_)AT91) += sysreset_at91.o
 obj-$(CONFIG_$(SPL_TPL_)SYSRESET_X86) += sysreset_x86.o
 obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o