esp_mm: removed empty kconfig files

- MMU configuration related kconfig options will be in soc, or
esp_hw_support
- Cache configuration related kconfig options will be in soc, or
esp_hw_support
- mmap driver and msync driver kconfig options will be still in esp_mm.
As there's no kconfig options for them yet, removed kconfig files

components/esp_mm/Kconfig

@@ -1,8 +0,0 @@
-menu "ESP Memory Management"
-
-    # Add MMU setting menu here
-    # Add Cache setting menu here
-
-    orsource "./Kconfig.mmap"
-
-endmenu  # ESP Memory Management

components/esp_mm/Kconfig.mmap

@@ -1,3 +0,0 @@
-menu "MMAP Configuration"
-
-endmenu