Use shared libutils instead of static for keystore fuzzers

Bug: http://b/197965342

These fuzzers depend on libhidlbase.so which already depends on
libutils.so.  Moving to shared dep for them doesn't increase their
shared-library closure.  Using libutils.a instead causes build failures
with upstream lld because lld tries to fetch symbols from libutils.a to
resolve undefined symbols from libhidlbase as well.

Test: cherry-pick aosp/2036867 and `mma system/keystore`
Change-Id: I4a2d215736867032a13686c31978eaeec17fc15a
1 file changed