Add finidat entries for f09/1850/clm6 cases

bld/namelist_files/namelist_defaults_ctsm.xml

@@ -1345,6 +1345,18 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
          lnd_tuning_mode="clm6_0_GSWP3v1" use_init_interp=".true."
 >lnd/clm2/initdata_esmf/ctsm5.2/clmi.I1850Clm60BgcCrop-ciso.1361-01-01.ne30pg3_mg17_c240317.nc
 </finidat>
+<finidat hgrid="0.9x1.25" mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
+         ic_ymd="18500101" sim_year="1850" do_transient_pfts=".false."
+         ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".false."
+         lnd_tuning_mode="clm6_0_GSWP3v1" use_init_interp=".true."
+>lnd/clm2/initdata_esmf/ctsm5.3/ctsm52018_f09_xsiceON_acON_pSASU.clm2.r.0201-01-01-00000.nc
+</finidat>
+<finidat hgrid="0.9x1.25" mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
+         ic_ymd="18500101" sim_year="1850" do_transient_pfts=".true."
+         ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
+         lnd_tuning_mode="clm6_0_GSWP3v1" use_init_interp=".true."
+>lnd/clm2/initdata_esmf/ctsm5.3/ctsm52018_f09_xsiceON_acON_pSASU.clm2.r.0201-01-01-00000.nc
+</finidat>
 
 <!--
      Present day IC (if use_init_interp is set and .true. then MUST still interpolate even on an exact match)