Use month in the range 1-12 for 3GPP2 SMS Time Stamp instead

Zero-based month is not needed anymore since android.text.format.Time is
replaced with LocalDateTime. For the safety, just rename "month" to
"monthOrdinal" in the range 1-12.

Bug: 146021623
Test: atest CdmaSmsTest

Change-Id: I0eb5bad9b3701217a6e4f44bfcd76013576d79d5
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>