soc/amd/picasso/Kconfig: drop EHCI_BAR

Picasso doesn't have any EHCI controllers, so it can't support EHCI
debug, so there is no need to specify a MMIO address for the early EHCI
BAR configuration.

Change-Id: I5e904c160c68805a8606a8b2d1ab4fb6172066e7
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49729
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/soc/amd/picasso/Kconfig

@@ -240,10 +240,6 @@ config HEAP_SIZE
 	hex
 	default 0xc0000
 
-config EHCI_BAR
-	hex
-	default 0xfef00000
-
 config PICASSO_FCH_IOAPIC_ID
 	hex
 	default 0x8