soc/intel/tigerlake: Drop unused SataEnable setting

`SataEnable` is set by some boards, but it doesn't have any effect since
its related FSP option is hooked up to the devicetree state. Thus, drop
it.

Change-Id: Id645bfcade7ca1d495fb8df538113b3d10392a82
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59884
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/google/deltaur/variants/baseboard/devicetree.cb

@@ -25,7 +25,6 @@ chip soc/intel/tigerlake
 	# FSP configuration
 	register "SaGv" = "SaGv_Disabled"
 
-	register "SataEnable" = "1"
 	register "SataMode" = "0"
 	register "SataSalpSupport" = "1"
 

src/mainboard/google/volteer/variants/baseboard/devicetree.cb

@@ -146,7 +146,6 @@ chip soc/intel/tigerlake
 	register "PcieClkSrcUsage[6]" = "PCIE_CLK_NOTUSED"
 
 	# Enable SATA
-	register "SataEnable" = "1"
 	register "SataMode" = "0"
 	register "SataSalpSupport" = "1"
 	register "SataPortsEnable[0]" = "0"

src/soc/intel/tigerlake/chip.h

@@ -215,7 +215,6 @@ struct soc_intel_tigerlake_config {
 	uint8_t SlowSlewRate;
 
 	/* SATA related */
-	uint8_t SataEnable;
 	uint8_t SataMode;
 	uint8_t SataSalpSupport;
 	uint8_t SataPortsEnable[8];