Move off of sp to ip

[BrianCurtis-NOAA]

Description

spack-stack 2.0.0 will not have sp installed nor support it. UFS should move away from sp in favor of ip.

#2860 (comment)

Solution

All references to sp should be changed to ip, and all compiling links adjusted accordingly

[AlexanderRichert-NOAA]

#2331 contains some relevant discussion on sp/ip issues