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added icmp checksum calculation

Merged added icmp checksum calculation
L2SDP-342 into master
Merged Reinier van der Walle requested to merge L2SDP-342 into master
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libraries/io/eth/src/vhdl/eth_control.vhd
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@@ -187,6 +187,8 @@ BEGIN
nxt_hdr_response_arr <= func_network_total_header_response_arp( rcv_hdr_words_arr, reg_config.mac_address, reg_config.ip_address);
ELSIF rcv_hdr_status.is_icmp='1' THEN
nxt_hdr_response_arr <= func_network_total_header_response_icmp(rcv_hdr_words_arr, reg_config.mac_address);
-- Calculate icmp checksum = original checksum + 0x0800.
nxt_hdr_response_arr(9)(c_halfword_w-1 DOWNTO 0) <= TO_UVEC( 2048 + TO_UINT(rcv_hdr_words_arr(9)(c_halfword_w-1 DOWNTO 0)), c_halfword_w);
ELSIF rcv_hdr_status.is_udp='1' THEN
nxt_hdr_response_arr <= func_network_total_header_response_udp( rcv_hdr_words_arr, reg_config.mac_address);
ELSIF rcv_hdr_status.is_ip='1' THEN