bd82x6x/ibexpeak: Make DRAM reset gate GPIO configurable

DRAM reset gate GPIO is different on different mobos move it to hidden config
with 60 (current value) as default.

Set it to 10 for Lenovo X201.

Change-Id: I4f3b6876d7c33d4966315091b63a76a9a0064c16
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/4622
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/southbridge/intel/ibexpeak/Kconfig

@@ -43,6 +43,10 @@ config EHCI_DEBUG_OFFSET
 	hex
 	default 0xa0
 
+config DRAM_RESET_GATE_GPIO
+	int
+	default 60
+
 config BOOTBLOCK_SOUTHBRIDGE_INIT
 	string
 	default "southbridge/intel/bd82x6x/bootblock.c"