common: cli_simple: use strlcpy instead of strcpy

common: cli_simple: use strlcpy instead of strcpy

Report Coverity log:
Destination buffer too small (STRING_OVERFLOW)
string_overflow: You might overrun the 1024 byte destination string
lastcommand by writing 1025 bytes from console_buffer

Signed-off-by: Peng Fan <[email protected]>
Cc: Heiko Schocher <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Tom Rini <[email protected]>
Reviewed-by: Simon Glass <[email protected]>