Changes

gprs_gmm: fix endianess of GSM48_IE_GMM_PDP_CTX_STATUS

The pdp_status is actually encoded as little endian,
but there is no tlvp_val16le yet.

Change-Id: Ib9bee2f8d0b1f89986d15cf3ce6404ad76378c8c
(cherry picked from commit b79797d0568ffd757540f6307d538135bdfa01b8)