soc/amd/stonyridge: Add misc device

oscout system clock is present in FCH misc device.
The kernel acpi misc driver will use the resource to
register oscout system clock.

BUG=b:74570989
TEST=Tested clock enable/disable in kernel driver

Change-Id: Ia90d3abab447fb5d27f454d9d6c33d0b5c3a0f16
Signed-off-by: Akshu Agrawal <akshu.agrawal@amd.com>
Reviewed-on: https://review.coreboot.org/25918
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/amd/stoneyridge/acpi/sb_fch.asl

@@ -14,6 +14,7 @@
  */
 
 #include <soc/gpio.h>
+#include <soc/iomap.h>
 
 Device (AAHB)
 {
@@ -137,3 +138,16 @@ Device (I2CD)
 		Return (0x0F)
 	}
 }
+
+Device (MISC)
+{
+	Name (_HID, "AMD0040")
+	Name (_UID, 0x3)
+	Name (_CRS, ResourceTemplate() {
+		Memory32Fixed(ReadWrite, MISC_MMIO_BASE, 0x100)
+	})
+	Method (_STA, 0x0, NotSerialized)
+	{
+		Return (0x0F)
+	}
+}