[Feature] add GA346 baseline version

Change-Id: Ic62933698569507dcf98240cdf5d9931ae34348f
diff --git a/src/kernel/linux/v4.19/arch/mips/alchemy/Makefile b/src/kernel/linux/v4.19/arch/mips/alchemy/Makefile
new file mode 100644
index 0000000..aac3b17
--- /dev/null
+++ b/src/kernel/linux/v4.19/arch/mips/alchemy/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_MIPS_GPR) += board-gpr.o
+obj-$(CONFIG_MIPS_MTX1) += board-mtx1.o
+obj-$(CONFIG_MIPS_XXS1500) += board-xxs1500.o