[c-nsp] ASR9001 Vs ASR1006

[Lukas Tribus]

> Isn't the 9001 effectively "a RSP440 bolted to a typhoon line card"?

That's what I thought too; and what Cisco is more or less implying,
but no, it isn't.

The 9001 has a 32bit quadcore Freescale PPC CPU while the RSP440
has a quadcore Intel x86-64 bit cpu.

Previously you could tell that:
"iosxr-p-" indicated a PPC CPU, while
"iosxr-px-" indicated a x86 CPU

But in XR 4.3 they unified those 2 platform images, not using a new
image prefix, but reusing "iosxr-px-" which now confusingly runs on
both PPC and X86 CPUs.