drivers: android: Fix the SPDX comment style

C source files should have `//` as SPDX comment and not `/**/`. Fix this
by running checkpatch on the file.

Signed-off-by: Mrinal Pandey <mrinalmni@gmail.com>
Link: https://lore.kernel.org/r/20200724131449.zvjutbemg3vqhrzh@mrinalpandey


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>