drivers: flash: esp32: Add cache flush and guard calls
drivers: flash: esp32: Add cache flush and guard calls

Add cache flush and guard calls in write and
erase api.

Signed-off-by: Sylvio Alves <bd63183a3ab542e2b25ff1e90971d4881e1bdbe5@espressif.com>

galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr