Fix incorrect Power destruction

(1) As the following call chain indicating, mModule is indeed not pointing to heap memory object, trying to delete it is illegal.
      HIDL_FETCH_IPower -> hw_get_module -> hw_get_module_by_class -> load(hardware/libhardware/hardware.c)

(2) Fix by removing 'delete'

Test: monkey test

Signed-off-by: Jintao Zhu <zhujtcsieee@gmail.com>
Signed-off-by: Steven Moreland <smoreland@google.com>
Change-Id: If95bd8823354cd862d105b96101f910dc1ca95a6