[socket] Set CLOEXEC flag for fd in android_get_control_socket()

This cl sets CLOEXEC flag for the file descriptor fetched as this
flag was disabled when inherited from the parent.

Bug: 275729094
Test: atest microdroid_manager
Change-Id: I2c4226ef8570b26245efe98999f792f6f8e6a377
2 files changed