mb/google/hatch,dedede,volteer: enable CHROMEOS_DRAM_PART_NUMBER_IN_CBI

Enable CHROMEOS_DRAM_PART_NUMBER_IN_CBI on hatch, dedede, and volteer
to use the common version of mainboard_get_dram_part_num().

Remove duplicate instances of mainboard_get_dram_part_num().

BUG=b:169789558, b:168724473
TEST="emerge-volteer coreboot && emerge-hatch coreboot &&
emerge-dedede coreboot" and verify it builds.

Change-Id: I4e29d3e7ef0f3370eab9a6996a5c4a21a636b40e
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45883
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/hatch/Kconfig

@@ -47,6 +47,7 @@ if BOARD_GOOGLE_HATCH_COMMON
 config CHROMEOS
 	bool
 	default y
+	select CHROMEOS_DRAM_PART_NUMBER_IN_CBI if !ROMSTAGE_SPD_SMBUS
 	select EC_GOOGLE_CHROMEEC_SWITCHES
 	select GBB_FLAG_FORCE_DEV_SWITCH_ON
 	select GBB_FLAG_FORCE_DEV_BOOT_USB