system: add kconfig option for using parts of SRAM1 for IRAM

Using parts of SRAM1 for IRAM allows apps with more statically allocated IRAM

Closes https://github.com/espressif/esp-idf/issues/9824

tools/ci/build_template_app.sh

@@ -23,6 +23,8 @@ gen_configs() {
     # CONFIG_COMPILER_OPTIMIZATION_PERF with flag -O2
     echo "CONFIG_COMPILER_OPTIMIZATION_PERF=y" > esp-idf-template/sdkconfig.ci.O2
     echo "CONFIG_BOOTLOADER_COMPILER_OPTIMIZATION_PERF=y" >> esp-idf-template/sdkconfig.ci.O2
+    # -O2 makes the bootloader too large to fit in the default space, otherwise(!)
+    echo "CONFIG_PARTITION_TABLE_OFFSET=0x10000" >> esp-idf-template/sdkconfig.ci.O2
 
     # This part will be built in earlier stage (pre_build job) with only cmake. Built with make in later stage
     # CONFIG_COMPILER_OPTIMIZATION_DEFAULT with flag -Og

tools/test_apps/system/startup/sdkconfig.ci.sram1_iram

@@ -0,0 +1,3 @@
+# Only ESP32 has this option
+CONFIG_IDF_TARGET="esp32"
+CONFIG_ESP_SYSTEM_ESP32_SRAM1_REGION_AS_IRAM=y