This commit includes several nfapi bug fixes

-cell_config.phy_cell_id is a uint16 and was being push/pulled
as a uint8_t
-several members of the p5 message we not push/pulled
-the second member of the ssb_mask_list is causing invalid tag length
-the error code of the push response was push8 when it should have
been a push32
-packing vendor extension causes invalid tag id(0x000)