mb/intel/kblrvp: Drop commented-out SD card config

This is most likely a copy-paste remnant, and will never be needed for
RVP8: the SDXC device does not exist on PCH-H (and RVP8 uses a PCH-H).

Change-Id: I69059a88dcdb032beaab5fb03981dccbae0db02e
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57227
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>

src/mainboard/intel/kblrvp/variants/rvp8/overridetree.cb

@@ -155,9 +155,6 @@ chip soc/intel/skylake
 		.tdp_pl2_override = 25,
 	}"
 
-	# Use default SD card detect GPIO configuration
-	#register "sdcard_cd_gpio" = "GPP_D10"
-
 	device domain 0 on
 		device pci 17.0 on  end # SATA
 		device pci 19.2 off end # I2C #4