Add checkSmsCmd in SMSDispatcher

Change-Id: I097700854792a18e8f67d0f961b1e6f7817412fe
Ref-Id: Ife13f53c3e0753807fefc6ab0795eb9bc41f064f

Conflicts:

	framework.jar.out/smali/com/android/internal/telephony/SMSDispatcher.smali