mb/google/brya: Add new google brya mainboard

This commit is a stub for brya, which is a an Intel Alder Lake-P
reference platform.

BUG=b:173562731
TEST=util/abuild/abuild -p none -t google/brya -a -c max

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Ia34130ff92a0a07063cb8e80527204b3a80184a0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47819
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
diff --git a/src/mainboard/google/brya/Kconfig b/src/mainboard/google/brya/Kconfig
new file mode 100644
index 0000000..f538ade
--- /dev/null
+++ b/src/mainboard/google/brya/Kconfig
@@ -0,0 +1,29 @@
+config BOARD_GOOGLE_BASEBOARD_BRYA
+	def_bool n
+	select BOARD_ROMSIZE_KB_32768
+	select HAVE_ACPI_TABLES
+	select SOC_INTEL_ALDERLAKE
+
+if BOARD_GOOGLE_BASEBOARD_BRYA
+
+config BASEBOARD_BRYA_LAPTOP
+	def_bool n
+	select SYSTEM_TYPE_LAPTOP
+
+config DEVICETREE
+	string
+	default "variants/baseboard/devicetree.cb"
+
+config MAINBOARD_DIR
+	string
+	default "google/brya"
+
+config MAINBOARD_FAMILY
+	string
+	default "Google_Brya0" if BOARD_GOOGLE_BRYA0
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "brya" if BOARD_GOOGLE_BRYA0
+
+endif # BOARD_GOOGLE_BASEBOARD_BRYA