csp_buffer: memcpy only what is used in the packet#36
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This is faster in most cases size is protected with if as the user could have set invalid packet length.
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This is faster in most cases
size is protected with if as the user could have set invalid packet length.
Test on Cortex-M0:
csp buffer size = 256
no buffer memset
packet of size 4 is 0.16 ms faster using this PR
packet of size 256 is 0.005 ms difference