[PATCH v4] api: increment ODP API version to 1.51.0

[MatiasElo]

Increment API version number to reflect the following changes:

Backward incompatible:

• ipsec: change per-packet outbound options to be optional by introducing odp_ipsec_capability_t.out_op capability bits

Backward compatible:

• general: clarify that invalid handles must not be passed to ODP API functions unless explicitly allowed
• classifier: clarify that a CoS must not be used as error CoS when calling odp_cos_destroy()
• crypto: add ODP_CIPHER_ALG_ZUC_NEA6 cipher and ODP_AUTH_ALG_ZUC_NIA6 auth algorithms with matching capability bits
• event vector: remove the default value from odp_event_aggr_config_t.event_type specification
• packet: remove the value range from the len parameter descriptions of odp_packet_push_head(), odp_packet_pull_head(), odp_packet_push_tail(), and odp_packet_pull_tail()
• packet: relax odp_packet_ref() specification regarding referencing relationship after pull or truncation operations
• pktio: clarify that odp_pktio_default_cos_set() may be called multiple times, each call replacing the previous default CoS binding
• pktio: clarify that odp_pktio_error_cos_set() may be called multiple times, each call replacing the previous error CoS binding
• timer: change odp_timer_pool_param_t.periodic.freq.freq_hz to a pointer to const
• timer: clarify odp_timer_pool_info() frequency values for ODP_TIMER_TYPE_PERIODIC_FREQ timer pools
• timer: clarify that parameter values unused by the timer pool type are undefined in odp_timer_pool_info()

V2:

• Minor tweaks
• Added timer_perf application changes