soc/{amd/stoneyridge,intel}: Don't select VBOOT_SEPARATE_VERSTAGE

Now the bootblock is not limited to 64K so integrating vboot into the
bootblock reduces the binary size. intel/apl is an exception since the
bootblock size is limited to 32K.

Change-Id: I5e02961183b5bcc37365458a3b10342e5bc2b525
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52788
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/soc/intel/cannonlake/Kconfig

@@ -267,7 +267,6 @@ config SOC_INTEL_COMMON_LPSS_UART_CLK_N_VAL
 	default 0xc35
 
 config VBOOT
-	select VBOOT_SEPARATE_VERSTAGE
 	select VBOOT_MUST_REQUEST_DISPLAY
 	select VBOOT_STARTS_IN_BOOTBLOCK
 	select VBOOT_VBNV_CMOS