mb/google/brya/var/banshee: select SOC_INTEL_RAPTORLAKE

Select SOC_INTEL_RAPTORLAKE to force coreboot to use the RPL FSP
headers for FSP as banshee is using a converged firmware image.

This effort also helps to save banshee boot time by 80-100ms as
RPL FSP is better optimized.

Additionally, Raptor Lake platform only needs 1 SIPI-SIPI which
saves 10ms of the boot time.

BUG=b:358254132
TEST=Able to build and boot google/banshee.

cold boot time w/o this CL

```
Total Time: 1,399,888
```

cold boot time w/ this CL

```
Total Time: 1,295,334
```

Change-Id: If22e07a4c1b35fe1d060ca523743c6c503937287
Signed-off-by: Ian Feng <ian_feng@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84949
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>

src/mainboard/google/brya/Kconfig

@@ -169,6 +169,7 @@ config BOARD_GOOGLE_BANSHEE
 	select DRIVERS_GENERIC_GPIO_KEYS
 	select INTEL_GMA_HAVE_VBT
 	select MEMORY_SODIMM
+	select SOC_INTEL_RAPTORLAKE
 
 config BOARD_GOOGLE_BRASK
 	select BOARD_GOOGLE_BASEBOARD_BRASK