soc/intel/icelake: add soc implementation for ETR address API

Add soc implementation for the new ETR address API.

Change-Id: I8383a60c2c4988948ab8b3e9a54330269d217868
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36568
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/icelake/pmutil.c

@@ -170,6 +170,11 @@ uintptr_t soc_read_pmc_base(void)
 	return (uintptr_t)pmc_mmio_regs();
 }
 
+uint32_t *soc_pmc_etr_addr(void)
+{
+	return (uint32_t *)(soc_read_pmc_base() + ETR);
+}
+
 void soc_get_gpi_gpe_configs(uint8_t *dw0, uint8_t *dw1, uint8_t *dw2)
 {
 	DEVTREE_CONST struct soc_intel_icelake_config *config;