frameworks/base: Fix aliasing violations

Fix violations of strict aliasing rules

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Work around uint16_t vs. char16_t confusion

Change-Id: I188e5a82b2dba821710eaea85d6cbef2ae004ce9
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>