Merge branch 'fix/fatfs_remove_utf16_support' into 'master'

FatFS: Disable UTF 16 filename encoding

Closes IDF-4795

See merge request espressif/esp-idf!18192

components/fatfs/Kconfig

@@ -180,8 +180,6 @@ menu "FAT Filesystem support"
 
         config FATFS_API_ENCODING_ANSI_OEM
             bool "API uses ANSI/OEM encoding"
-        config FATFS_API_ENCODING_UTF_16
-            bool "API uses UTF-16 encoding"
         config FATFS_API_ENCODING_UTF_8
             bool "API uses UTF-8 encoding"
     endchoice

components/fatfs/src/ffconf.h

@@ -147,8 +147,6 @@
 
 #ifdef CONFIG_FATFS_API_ENCODING_UTF_8
 #define FF_LFN_UNICODE      2
-#elif defined(CONFIG_FATFS_API_ENCODING_UTF_16)
-#define FF_LFN_UNICODE      1
 #else /* CONFIG_FATFS_API_ENCODING_ANSI_OEM */
 #define FF_LFN_UNICODE      0
 #endif