mb/google/dedede: Update Imon slope and Offset Value for Drawcia

Updating Imon slope and offset values as per recommendation of
ODM based on calibaration.
Updating Imon slope to 1.0 and offset to 1.4

BUG=b:167294777
BRANCH=dedede
TEST=Boot dedede platform and confirm values in FSP.

Change-Id: I3eb32218040163f0abef9b8dd4c52efb16289fe7
Signed-off-by: Meera Ravindranath <meera.ravindranath@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48072
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Vinay Kumar <vinay.kumar@intel.com>
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
diff --git a/src/mainboard/google/dedede/variants/drawcia/overridetree.cb b/src/mainboard/google/dedede/variants/drawcia/overridetree.cb
index 45d0b32..dcb46cc 100644
--- a/src/mainboard/google/dedede/variants/drawcia/overridetree.cb
+++ b/src/mainboard/google/dedede/variants/drawcia/overridetree.cb
@@ -63,6 +63,8 @@
 	}"
 
 	register "tcc_offset" = "20"	# TCC of 85C
+	register "ImonOffset" = "1400"  # Imon Offset = 1.4
+	register "ImonSlope" = "100"    # Imon Slope = 1.0
 
 	device domain 0 on
 		device pci 05.0 on # IPU - MIPI Camera