mb/google/dedede: Drop selection of GENERIC_SPD_BIN

GENERIC_SPD_BIN assumes that the SPDs are all placed in mainboard and
have .spd.hex as the suffix. Disable GENERIC_SPD_BIN for dedede as it
already provides its own rules for SPD inclusion. In follow up
changes, GENERIC_SPD_BIN can be re-enabled by updating gen_spd.go tool
to use similar suffixes and allowing different paths to be provided
for SPD by mainboard.

Change-Id: If10144e0b2bd67884af69f60e5117e388a3ae5da
Signed-off-by: Furquan Shaikh <furquan@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/42054
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/dedede/Kconfig

@@ -8,7 +8,6 @@ config BOARD_GOOGLE_BASEBOARD_DEDEDE
 	select EC_GOOGLE_CHROMEEC_BOARDID
 	select EC_GOOGLE_CHROMEEC_ESPI
 	select EC_GOOGLE_CHROMEEC_SKUID
-	select GENERIC_SPD_BIN
 	select GOOGLE_SMBIOS_MAINBOARD_VERSION
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES