mb/google/nissa/var/pujjoniru: Add Fn key scancode

The Fn key on pujjoniru emits a scancode of 94 (0x5e).

BUG=b:398943428
TEST=Flash Pujjoniru, boot to Linux kernel, and verify that KEY_FN is
generated when pressed using `evtest`.

Change-Id: I8eb7f253a637741b0aa45aac4d1d59bd0309d559
Signed-off-by: Hualin Wei <weihualin@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/86589
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Qinghong Zeng <zengqinghong@huaqin.corp-partner.google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>

src/mainboard/google/brya/Kconfig

@@ -482,6 +482,7 @@ config BOARD_GOOGLE_PUJJONIRU
 	select DRIVERS_GENERIC_GPIO_KEYS
 	select DRIVERS_GFX_GENERIC
 	select DRIVERS_AUDIO_SOF
+	select MAINBOARD_HAS_GOOGLE_STRAUSS_KEYBOARD
 	select SOC_INTEL_TWINLAKE
 
 config BOARD_GOOGLE_QUANDISO