Fixes for the Netlogic XLP on-chip RSA block driver

The changes are to:
* Use contigmalloc/contigfree which handling microcode buffer
* Use a different buffer to send microcode to each engine
* Swap microcode in little-endian compilation
* Fix freeback message queue id field
* Simplify xlp_get_rsa_opsize() to remove unnecessary checks
* Fix NULL check after use in xlp_free_cmd_params()
* Do better error handling when the hardware returns error
* Fix error codes in few cases

Submitted by:	Vekatesh J. V. <venkatesh.vivekanandan@broadcom.com>
Approved by:	re (hrs)