ANDROID: DEBUG: fix build error when Macro DEBUG_EENV_DECISIONS is defined

with the following commit:

1c3821bc ("ANDROID: DEBUG: accumulate debug output and dump all at the end of energy_diff")

In struct energy_env, member variable cpu_array_len does not exist.

Bug: 120440300
Signed-off-by: Samer Xie <samer.xie@unisoc.com>