soc/intel/denverton_ns/Kconfig: Drop unused 'IQAT_MEMORY_REGION_SIZE'

Change-Id: I25cfc61b7a25b68dd22573a88933e03931a755ef
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45069
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Guckian <d.guckian20@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/denverton_ns/Kconfig

@@ -120,13 +120,6 @@ config IQAT_ENABLE
 	bool "Enable IQAT"
 	default y
 
-config IQAT_MEMORY_REGION_SIZE
-	depends on IQAT_ENABLE
-	hex
-	default 0x100000
-	help
-	  Do not change this value
-
 config HSUART_DEV
 	hex
 	default 0x1a