Do not log an error about ro.sf.lcd_density on emulators

The code already has all support, but still
logs an error.

Bug: 258856313
Test: boot emulator, check logcat
Change-Id: I69630586ca234db21ea1fbe0d70bbe21155f0b4d
Signed-off-by: Roman Kiryanov <rkir@google.com>