Fix wrong calculation of ota sp Number schema

The system selection code schema is:
    SELC,the # of code pairs,min1,max1,min2,max2,...
    e.g "SELC,3,10,20,30,40,60,70" indicates that there are 3 pairs of
    selection codes, and they are {10,20}, {30,40} and {60,70} respectively.
The checkOtaSpNumBasedOnSysSelCode API is implemented with incorrect logic.
So, fixed wrong calculation of ota sp Number schema.

Change-Id: I59781f0660cfe8a115841ccee3cbed7cbba11c04
Signed-off-by: Shinchul Kang <shinchul.kang@lge.com>