ANDROID: GKI: Add 64-bit RISC-V config

Add a "fake" GKI for RISC-V based on the arm64 one. This implementation
simply symlinks the arm64 gki_defconfig and merges in two other configs:

- arch/riscv/configs/64-bit.config
  This is an upstream file which enables RISC-V for 64-bit.

- arch/riscv/configs/gki.config
  This is a workaround file which enables things the ARM64 architecture
  pre-selects, such as GPIOLIB. Without enabling these options, some
  drivers are incorrectly dropped from the gki_defconfig.

Bug: 260012551
Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: Ifad59ed483bdbb736e905eefc5107328155a361b

BUILD.bazel

@@ -22,6 +22,9 @@ define_common_kernels(target_configs = {
     "kernel_aarch64_debug": {
         "module_implicit_outs": COMMON_GKI_MODULES_LIST,
     },
+    "kernel_riscv64": {
+        "module_implicit_outs": COMMON_GKI_MODULES_LIST,
+    },
     "kernel_x86_64": {
         "kmi_symbol_list_strict_mode": False,
         "module_implicit_outs": COMMON_GKI_MODULES_LIST,

arch/riscv/configs/gki.config

@@ -0,0 +1,2 @@
+CONFIG_CPU_FREQ=y
+CONFIG_GPIOLIB=y

arch/riscv/configs/gki_defconfig

@@ -0,0 +1 @@
+../../arm64/configs/gki_defconfig

build.config.gki.riscv64

@@ -0,0 +1,26 @@
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.common
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.riscv64
+. ${ROOT_DIR}/${KERNEL_DIR}/build.config.gki
+
+MAKE_GOALS="${MAKE_GOALS}
+Image.lz4
+Image.gz
+"
+
+FILES="${FILES}
+arch/riscv/boot/Image.lz4
+arch/riscv/boot/Image.gz
+"
+
+BUILD_SYSTEM_DLKM=1
+MODULES_LIST=${ROOT_DIR}/${KERNEL_DIR}/android/gki_system_dlkm_modules
+
+BUILD_GKI_CERTIFICATION_TOOLS=1
+
+BUILD_GKI_ARTIFACTS=1
+BUILD_GKI_BOOT_IMG_SIZE=67108864
+BUILD_GKI_BOOT_IMG_GZ_SIZE=47185920
+BUILD_GKI_BOOT_IMG_LZ4_SIZE=53477376
+
+PRE_DEFCONFIG_CMDS="mkdir -p \${OUT_DIR}/arch/riscv/configs/ && cat ${ROOT_DIR}/${KERNEL_DIR}/arch/riscv/configs/gki_defconfig ${ROOT_DIR}/${KERNEL_DIR}/arch/riscv/configs/64-bit.config ${ROOT_DIR}/${KERNEL_DIR}/arch/riscv/configs/gki.config > \${OUT_DIR}/arch/riscv/configs/${DEFCONFIG};"
+POST_DEFCONFIG_CMDS=""

build.config.riscv64

@@ -0,0 +1,14 @@
+ARCH=riscv
+MAKE_GOALS="
+Image
+modules
+"
+
+FILES="
+arch/riscv/boot/Image
+vmlinux
+System.map
+vmlinux.symvers
+modules.builtin
+modules.builtin.modinfo
+"