feat(boards): kakuteh7v2 tune logger for 128 MB W25N flash

Replace the old SDLOG_DIRS_MAX=3 + larger-buffer override with the
new rotation-based tuning: SDLOG_MAX_SIZE=40 caps each log file at
40 MB so a handful of recent logs fit, and SDLOG_ROTATE=95 lets logs
fill up to 95% of the 128 MB volume.

Drop the BOARD_SMALL_FLASH_LOGGING define from board_config.h; the
logger no longer keys off a per-board compile flag.

boards/holybro/kakuteh7v2/init/rc.board_defaults

@@ -35,6 +35,7 @@ param set-default SYS_DM_BACKEND 1
 # Ignore that there is no SD card
 param set-default COM_ARM_SDCARD 0
 
-# W25N NAND flash with littlefs (128 MB): larger buffer, auto-rotate
-set LOGGER_BUF 32
-param set-default SDLOG_DIRS_MAX 3
+# W25N NAND flash with littlefs (128 MB): small log file size so we can keep
+# a few recent logs, and fill up to 95%.
+param set-default SDLOG_ROTATE 95
+param set-default SDLOG_MAX_SIZE 40

boards/holybro/kakuteh7v2/src/board_config.h

@@ -59,11 +59,6 @@
 #  define BOARD_HAS_NBAT_V              1
 #  define BOARD_HAS_NBAT_I              1
 
-/* Enable small flash logging support (for W25N NAND flash) */
-#ifdef CONFIG_MTD_W25N
-#  define BOARD_SMALL_FLASH_LOGGING 1
-#endif
-
 /* Holybro KakuteH7 GPIOs ************************************************************************/
 
 /* LEDs are driven with push open drain to support Anode to 5V or 3.3V */