Create symlink for bionic files

This change creates following symlinks for bionic files.

/system/lib/libc.so -> /apex/com.android.runtime/lib/bionic/libc.so
/system/lib/libm.so -> /apex/com.android.runtime/lib/bionic/libm.so
/system/lib/libdl.so -> /apex/com.android.runtime/lib/bionic/libdl.so
/system/bin/linker -> /apex/com.android.runtime/bin/linker
...

This allows us to not have mountpoints under /bionic.

Bug: 125549215
Test: m and inspect the symlinks in the system partition.
Change-Id: I3a58bf4f88c967862dbf06065a1af8fc4700dda3

cc/cc.go

@@ -599,6 +599,14 @@ func (c *Module) bootstrap() bool {
 	return Bool(c.Properties.Bootstrap)
 }
 
+func isBionic(name string) bool {
+	switch name {
+	case "libc", "libm", "libdl", "linker":
+		return true
+	}
+	return false
+}
+
 type baseModuleContext struct {
 	android.BaseContext
 	moduleContextImpl