Update hygroscopicity for below cloud scavenging

[tilmes]

What happened?

The current code uses hard coded values for below cloud hygroscopicity that are not aligned with values in the physprop files. For consistency, it would be good to fix this issue.

What are the steps to reproduce the bug?

Read hygro values from physprob files and use those instead of hard-coded values in aerosol_state_mod.F90
in function sol_factb_interstitial. Also, add namelist variables for different aerosols to be able to change those values as tuning variables.

What CAM tag were you using?

alpha07e

What machine were you running CAM on?

CISL machine (e.g. cheyenne)

What compiler were you using?

Intel

Path to a case directory, if applicable

No response

Will you be addressing this bug yourself?

Yes

Extra info

No response