mb/intel/jslrvp: Update SLP_Sx assertion widths and PwrCycDur

This patch updates the SLP_Sx assertion widths and power cycle duration
for the Japerlake RVP.

Power cycle duration:
With default value,
     S0->S5 -> [ ~4.2 seconds delay ] -> S5->S0

With value set to 1,
     S0->S5 -> [ ~1.2 seconds delay ] -> S5->S0

BUG=b:159104150
TEST=Verified that the power cycle duration is ~1.2s with global
         reset on JSLRVP.

Change-Id: Ie2a8d959d7ebbf9c24f8c4e8d5c68b70e0ac5708
Signed-off-by: V Sowmya <v.sowmya@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43793
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Reviewed-by: Ronak Kanabar <ronak.kanabar@intel.com>
Reviewed-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>

src/mainboard/intel/jasperlake_rvp/variants/jslrvp/devicetree.cb

@@ -154,6 +154,20 @@ chip soc/intel/jasperlake
 		},
 	}"
 
+	# Set the minimum assertion width
+	register "PchPmSlpS3MinAssert"  = "3"  # 50ms
+	register "PchPmSlpS4MinAssert"  = "1"  # 1s
+	register "PchPmSlpSusMinAssert" = "3"  # 1s
+	register "PchPmSlpAMinAssert"   = "3"  # 98ms
+
+	# NOTE: Duration programmed in the below register should never be smaller than the
+	# stretch duration programmed in the following registers -
+	#       - GEN_PMCON_A.SLP_S3_MIN_ASST_WDTH (PchPmSlpS3MinAssert)
+	#       - GEN_PMCON_A.S4MAW (PchPmSlpS4MinAssert)
+	#       - PM_CFG.SLP_A_MIN_ASST_WDTH (PchPmSlpAMinAssert)
+	#       - PM_CFG.SLP_LAN_MIN_ASST_WDTH
+	register "PchPmPwrCycDur" = "1"       # 1s
+
 	device domain 0 on
 		device pci 00.0 on  end # Host Bridge
 		device pci 02.0 on  end # Integrated Graphics Device