Migrate dump_power.sh contents into cpp for improved speed

Bug: 271355543
Test: adb bugreport and check dumpstate_board.txt
Change-Id: Ic4e7c1a8198aedc3d2f5b3880ce60aa45843ec2d

dumpstate/Android.bp

@@ -9,11 +9,21 @@ sh_binary {
     sub_dir: "dump",
 }
 
-sh_binary {
-    name: "dump_power.sh",
-    src: "dump_power.sh",
+cc_binary {
+    name: "dump_power",
+    srcs: ["dump_power.cpp"],
+    cflags: [
+        "-Wall",
+	"-Wextra",
+	"-Werror",
+    ],
+    shared_libs: [
+        "libbase",
+        "libdump",
+        "libdumpstateutil",
+    ],
     vendor: true,
-    sub_dir: "dump",
+    relative_install_path: "dump",
 }
 
 sh_binary {