mb/google/eldrid: Fix use of float

Floats are not allowed in coreboot.
As the compiler rounded down the value, do so in the code too as this
is a known good value.

Change-Id: I4e180d4cb8e0e1aa68186bfc1daffdc5c339dc64
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64240
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

src/mainboard/google/volteer/variants/eldrid/overridetree.cb

@@ -100,7 +100,7 @@ chip soc/intel/tigerlake
 				## Passive Policy
 				register "policies.passive" = "{
 					[0] = DPTF_PASSIVE(CPU,CPU,87,5000),
-					[1] = DPTF_PASSIVE(CPU,TEMP_SENSOR_2,60.8,6000)}"
+					[1] = DPTF_PASSIVE(CPU,TEMP_SENSOR_2,60,6000)}"
 
 				## Critical Policy
 				register "policies.critical" = "{