Remove redundant dependency on libpower

* libpower dependency was introduced in change
  I1e8d49b087eff6301373e1e90e8d868f15847c34
* It is never used in any part of the system/bt stack and therefore
  should be removed from the shared library dependency list

Bug: 34079981
Test: code compilation, no user visible effect
Change-Id: Ic8e3ad0c369839fb9ced446695c72fdf0ffad1ca

system/main/Android.mk

@@ -48,7 +48,6 @@ LOCAL_SHARED_LIBRARIES := \
     libdl \
     liblog \
     libz \
-    libpower \
     libprotobuf-cpp-lite \
     libaudioclient \
     libutils \