Better error code for ESPIPE lseek failure (not OS_ERR_NOT_IMPLEMENTED)

[skliper]

Is your feature request related to a problem? Please describe.
OS_ERR_NOT_IMPLEMENTED error code used for ESPIPE lseek error:

osal/src/os/portable/os-impl-posix-io.c

Lines 132 to 141 in ead5723

	if (errno == ESPIPE)
	{
	/*
	* this means the user tried to seek on a pipe, socket,
	* or other fifo-like handle that doesn't support seeking.
	*
	* Use a different error code to differentiate from an
	* error involving a bad whence/offset
	*/
	retval = OS_ERR_NOT_IMPLEMENTED;

Describe the solution you'd like
Replace error code with something more appropriate

Describe alternatives you've considered
None

Additional context
None

Requester Info
Jacob Hageman - NASA/GSFC, OSAL code review