nb/amd/agesa: Remove leftover code

This code is now unused by any platform.

Change-Id: I5464daa8cfb8231e2b19447c343fc80ab1d68ce8
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69119
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/northbridge/amd/agesa/Kconfig

@@ -1,34 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0-only
-
-config NORTHBRIDGE_AMD_AGESA
-	bool
-
-if NORTHBRIDGE_AMD_AGESA
-
-config BOTTOMIO_POSITION
-	hex "Bottom of 32-bit IO space"
-	default 0x80000000
-	help
-	  If PCI peripherals with big BARs are connected to the system
-	  the bottom of the IO must be decreased to allocate such devices.
-
-	  Declare the beginning of the 128MB-aligned MMIO region.  This
-	  option is useful when PCI peripherals requesting large address
-	  ranges are present, for example, graphic cards.
-
-config CONSOLE_VGA_MULTI
-	bool
-	default n
-
-config S3_VGA_ROM_RUN
-	bool
-	default n
-
-source "src/northbridge/amd/agesa/*/Kconfig"
-
-# TODO: Reservation for heap seems excessive
-config HEAP_SIZE
-	hex
-	default 0xc0000
-
-endif # NORTHBRIDGE_AMD_AGESA