libeffects: Removed the unused/redundant code in lvm/lib

Retained the code as per the macros defined and removed all
conditional compilation checks for BUILD_FLOAT, HIGHER_FS,
NATIVE_FLOAT_BUFFER, LVM_PCM, MUL32x32INTO32,
MUL32x16INTO32 and ADD2_SAT_32x32.
Removed multiple blank lines in the code and replaced
with one blank line.


Test: android.media.cts.AudioEffectTest
Test: android.media.cts.AudioPreProcessingTest
Test: android.media.cts.BassBoostTest
Test: android.media.cts.EnvReverbTest
Test: android.media.cts.EqualizerTest
Test: android.media.cts.LoudnessEnhancerTest
Test: android.media.cts.PresetReverbTest
Test: android.media.cts.VirtualizerTest
Test: android.media.cts.VisualizerTest
Test: Tested using standalone application
Bug: 129491957

Change-Id: I392f890811e4277ee13cbfddae07da5b122ca645