Create emulator_* devices for emulators

aosp_arm64 has no emulators after the patch:

https://android-review.googlesource.com/c/platform/build/+/1286895

The patch creates all other emulator_* devices by cloning from
generic_*, and modify all sdk_phone_* to use them.

Bug: 111538404
Test: build sdk_phone_armv7-userdebug
Test: build sdk_phone_x86_64-userdebug
Test: build sdk_phone_x86-userdebug
Change-Id: I2b82e999ea919f005729f322cd948e6b72ba6843
diff --git a/target/product/sdk_phone_x86.mk b/target/product/sdk_phone_x86.mk
index e8c60b4..bcee066 100644
--- a/target/product/sdk_phone_x86.mk
+++ b/target/product/sdk_phone_x86.mk
@@ -16,12 +16,17 @@
 QEMU_USE_SYSTEM_EXT_PARTITIONS := true
 PRODUCT_USE_DYNAMIC_PARTITIONS := true
 
+# This is a build configuration for a full-featured build of the
+# Open-Source part of the tree. It's geared toward a US-centric
+# build quite specifically for the emulator, and might not be
+# entirely appropriate to inherit from for on-device configurations.
+
 #
 # All components inherited here go to system image
 #
 $(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
 
-# Enable mainline checking for excat this product name
+# Enable mainline checking for exact this product name
 ifeq (sdk_phone_x86,$(TARGET_PRODUCT))
 PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := relaxed
 endif
@@ -42,7 +47,7 @@
 #
 $(call inherit-product-if-exists, device/generic/goldfish/x86-vendor.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/emulator_vendor.mk)
-$(call inherit-product, $(SRC_TARGET_DIR)/board/generic_x86/device.mk)
+$(call inherit-product, $(SRC_TARGET_DIR)/board/emulator_x86/device.mk)
 
 # Define the host tools and libs that are parts of the SDK.
 -include sdk/build/product_sdk.mk
@@ -51,5 +56,5 @@
 # Overrides
 PRODUCT_BRAND := Android
 PRODUCT_NAME := sdk_phone_x86
-PRODUCT_DEVICE := generic_x86
+PRODUCT_DEVICE := emulator_x86
 PRODUCT_MODEL := Android SDK built for x86