ppc64_cpu: handle endianess in rtas sysparm buffer
ppc64_cpu: handle endianess in rtas sysparm buffer

ppc64_cpu passes a buffer to rtas_set_sysparm.  The first two
bytes of this buffer must encode a integer denoting the
size of the remaining the buffer. This integer must be in a
big endian format.

Signed-off-by: Thomas Falcon <3be58c5f4f5b8a6fb702b2062dd3fbac29655c50@linux.vnet.ibm.com>

mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils,shenki/powerpc-utils,mdroth/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,leitao/powerpc-ibm-utils-debian,kamalesh-babulal/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian