mb/google/poppy/variants/nami: Enable DPTF and configure DPTF parameters

The commit enables DPTF function. The DPTF parameters are provided by
thermal team.

BUG=b:72974136
BRANCH=poppy
TEST=emerge-nami coreboot then check the parameters in DPTF ui tool

Change-Id: I9b7ae34ee64f19ef783a8c1571831b2293105a18
Signed-off-by: Frank Wu <frank_wu@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/25564
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/poppy/variants/nami/devicetree.cb b/src/mainboard/google/poppy/variants/nami/devicetree.cb
index a04dd95..de5fb67 100644
--- a/src/mainboard/google/poppy/variants/nami/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nami/devicetree.cb
@@ -21,6 +21,9 @@
 	# EC memory map range is 0x900-0x9ff
 	register "gen3_dec" = "0x00fc0901"
 
+	# Enable DPTF
+	register "dptf_enable" = "1"
+
 	# Enable S0ix
 	register "s0ix_enable" = "1"