soc/amd: Remove Kconfig BOOTBLOCK_ADDR

Due the location of X86_RESET_VECTOR, the anchor point
for linking the bootblock is at the end, which equals
ROMSTAGE_ADDR.

Change-Id: I2d25911582393c9a10fd3afa1a484eda2604d95a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/picasso/Kconfig

@@ -120,12 +120,6 @@ config PRERAM_CBMEM_CONSOLE_SIZE
 	help
 	  Increase this value if preram cbmem console is getting truncated
 
-config BOOTBLOCK_ADDR
-	hex
-	default 0x2030000
-	help
-	  Sets the address in DRAM where bootblock should be loaded.
-
 config C_ENV_BOOTBLOCK_SIZE
 	hex
 	default 0x10000