coreboot_tables: Drop uart PCI addr

Only edk2 used this to fill in a different struct but even there the
entries go unused, so removing this struct element from coreboot has
no side effects.

Change-Id: Iadd2678c4e01d30471eac43017392d256adda341
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68767
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>

payloads/libpayload/include/coreboot_tables.h

@@ -191,14 +191,6 @@ struct cb_serial {
 	 * decisions as to which dividers to select and their values
 	 * to eventually arrive at the desired console baud-rate. */
 	u32 input_hertz;
-
-	/* UART PCI address: bus, device, function
-	 * 1 << 31 - Valid bit, PCI UART in use
-	 * Bus << 20
-	 * Device << 15
-	 * Function << 12
-	 */
-	u32 uart_pci_addr;
 };
 
 struct cb_console {