soc/qualcomm/x1p42100: Select HAVE_CBFS_FILE_OPTION_BACKEND

Select the newly introduced `HAVE_CBFS_FILE_OPTION_BACKEND` capability
for the Qualcomm x1p42100 SoC family.

This SoC is used in ChromeOS devices that rely on the CBFS file backend
to store and retrieve runtime configuration options (like the QCLib
configuration data). Selecting this capability ensures the correct
option backend is chosen in the Kconfig `Option backend to use` choice.

TEST=Build and boot a board using the x1p42100 SoC (e.g., bluey).
     Confirm the `CONFIG_USE_CBFS_FILE_OPTION_BACKEND` option is enabled
     in the build.

Change-Id: Ie0dee155a504da215669a79d7100cdbaf97d5261
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89186
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/soc/qualcomm/x1p42100/Kconfig

@@ -17,6 +17,7 @@ config SOC_QUALCOMM_BASE
 	select GENERIC_GPIO_LIB
 	select GENERIC_UDELAY
 	select HAS_RECOVERY_MRC_CACHE
+	select HAVE_CBFS_FILE_OPTION_BACKEND
 	select HAVE_LINEAR_FRAMEBUFFER
 	select HAVE_MONOTONIC_TIMER
 	select HAVE_UART_SPECIAL