Removed libcoap.so and added libconnectivity_abstraction.so dependency

Removed libcoap.so and added libconnectivity_abstraction.so dependency
in ResourceHostingSample and SampleProvierApp Android.mk files

Change-Id: I3a13319aa1629b7874646f1626cf173ebbe2a09c
Signed-off-by: Harish Kumara Marappa <h.marappa@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1093
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: RadhaBhavani <radha.p@samsung.com>
Reviewed-by: Madan Lanka <lanka.madan@samsung.com>
Reviewed-by: kwon doil <doil.kwon@samsung.com>
Reviewed-by: Uze Choi <uzchoi@samsung.com>