mb/asrock/g41c-gs: Fix the SATA clock output on ck505

With reset default of the clockgen on this board the SATA clock which
needs to be 100MHz depends on FSB BSEL straps.

This explains why SATA was originally tested to be working but fails
with CPUs operating at different FSB.

This change sets a bit in the clockgen configuration which fixes the
SATA clock.

TESTED on with a 1333MHz FSB CPU.

Change-Id: Ic2b8ca91920f015ae3265871bc092023302fefdc
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/21257
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>

src/mainboard/asrock/g41c-gs/Kconfig

@@ -33,6 +33,7 @@ config BOARD_SPECIFIC_OPTIONS
 	select HAVE_OPTION_TABLE
 	select HAVE_CMOS_DEFAULT
 	select HAVE_ACPI_RESUME
+	select DRIVERS_I2C_CK505
 
 config MAINBOARD_DIR
 	string

src/mainboard/asrock/g41c-gs/devicetree.cb

@@ -140,6 +140,12 @@ chip northbridge/intel/x4x		# Northbridge
 			end
 			device pci 1f.3 on		# SMbus
 				subsystemid 0x1849 0x27da
+				chip drivers/i2c/ck505	# W83115RG-965
+					# set SATA to fixed 100Mhz refclk
+					register "mask" = "{ 0x02 }"
+					register "regs" = "{ 0x02 }"
+				device i2c 69 on end
+				end
 			end
 			device pci 1f.4 off end
 			device pci 1f.5 off end