ANDROID: add a symbol to unisoc symbol list

To implement the devfreq cooling device registration by
energy model, it should add devfreq_cooling_em_register
to symbol list.

1 function symbol(s) added
  'struct thermal_cooling_device* devfreq_cooling_em_register(struct devfreq*, struct devfreq_cooling_power*)'

Bug: 288934529

Signed-off-by: Di Shen <di.shen@unisoc.com>
Change-Id: I168a5bf1130edd7e53f107deb5c606fc98a95953