zork: Control DPTC with only Kconfig

Moving the config value SOC_AMD_COMMON_BLOCK_ACPI_DPTC to
soc/amd/picasso/Kconfig and conditionally enabling it for only Morphius
boards makes the value dptc_tablet_mode_enable redundant.

This CL removes dptc_tablet_mode_enable so DPTC is controlled entirely
with the Kconfig value SOC_AMD_COMMON_BLOCK_ACPI_DPTC. This means DPTC
is only included for boards that actually enable it.

BRANCH=none
BUG=b:217911928
TEST=Build zork

Signed-off-by: Tim Van Patten <timvp@google.com>
Change-Id: Ic54a9bb491234088be8184bec8b09e2e31ffa298
Reviewed-on: https://review.coreboot.org/c/coreboot/+/67635
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
diff --git a/src/soc/amd/picasso/root_complex.c b/src/soc/amd/picasso/root_complex.c
index afa8565..2fe8a21 100644
--- a/src/soc/amd/picasso/root_complex.c
+++ b/src/soc/amd/picasso/root_complex.c
@@ -184,10 +184,7 @@
 {
 	const struct soc_amd_picasso_config *config = config_of_soc();
 
-	if (!config->dptc_tablet_mode_enable)
-		return;
-
-	/* DPTC is enabled. Always fill out the default DPTC values. */
+	/* Normal mode DPTC values. */
 	struct dptc_input default_input = DPTC_INPUTS(config->thermctl_limit_degreeC,
 							config->sustained_power_limit_mW,
 							config->fast_ppt_limit_mW,
@@ -207,7 +204,8 @@
 static void root_complex_fill_ssdt(const struct device *device)
 {
 	acpi_fill_root_complex_tom(device);
-	acipgen_dptci();
+	if (CONFIG(SOC_AMD_COMMON_BLOCK_ACPI_DPTC))
+		acipgen_dptci();
 }
 
 static const char *gnb_acpi_name(const struct device *dev)