mb/starlabs/*: Enable Energy Efficient Turbo for all ADL boards

This reduces power consumption so enable it. For example,
`starbook/adl_n` idles at 5.16W with this disabled, but 4.6W with
it enabled.

Change-Id: I5b6fd4853aba0dd4e9f9f45be4b43efff375dfad
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86867
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>

src/mainboard/starlabs/byte_adl/variants/mk_ii/devicetree.cb

@@ -2,6 +2,7 @@ chip soc/intel/alderlake
 	# FSP UPDs
 	register "enable_c6dram"		= "true"
 	register "eist_enable"			= "true"
+	register "energy_efficient_turbo"	= "true"
 	register "cnvi_bt_core"			= "true"
 	register "sagv"				= "SaGv_Enabled"
 

src/mainboard/starlabs/starbook/variants/adl/devicetree.cb

@@ -2,6 +2,7 @@ chip soc/intel/alderlake
 	# FSP UPDs
 	register "eist_enable"			= "true"
 	register "enable_c6dram"		= "1"
+	register "energy_efficient_turbo"	= "true"
 	register "sagv"				= "SaGv_Enabled"
 
 	# Serial I/O

src/mainboard/starlabs/starbook/variants/adl_n/devicetree.cb

@@ -2,6 +2,7 @@ chip soc/intel/alderlake
 	# FSP UPDs
 	register "eist_enable"			= "true"
 	register "enable_c6dram"		= "true"
+	register "energy_efficient_turbo"	= "true"
 	register "sagv"				= "SaGv_Enabled"
 
 	# Serial I/O

src/mainboard/starlabs/starbook/variants/rpl/devicetree.cb

@@ -4,6 +4,7 @@ chip soc/intel/alderlake
 	register "eist_enable"				= "true"
 	register "enable_c1e"				= "true"
 	register "enable_c6dram"			= "true"
+	register "energy_efficient_turbo"		= "true"
 	register "sagv"					= "SaGv_Enabled"
 
 	# Serial I/O

src/mainboard/starlabs/starfighter/variants/rpl/devicetree.cb

@@ -4,6 +4,7 @@ chip soc/intel/alderlake
 	register "eist_enable"				= "true"
 	register "enable_c1e"				= "true"
 	register "enable_c6dram"			= "true"
+	register "energy_efficient_turbo"		= "true"
 	register "sagv"					= "SaGv_Enabled"
 
 	# Serial I/O

src/mainboard/starlabs/starlite_adl/variants/mk_v/devicetree.cb

@@ -2,6 +2,7 @@ chip soc/intel/alderlake
 	# FSP UPDs
 	register "cnvi_bt_core"			= "true"
 	register "enable_c6dram"		= "true"
+	register "energy_efficient_turbo"	= "true"
 	register "eist_enable"			= "true"
 	register "sagv"				= "SaGv_Enabled"