renesas-ra: Change file system size to 64KB for RA6M1.

Changes in this commit:
- Change file system size from 128KB to 64KB in ra6m1_ek.ld.
- Change EK-RA6M1's file system size in renesas-ra port document.

Signed-off-by: Takeo Takahashi <[email protected]>

Author: TakeoTakahashi2020

docs/renesas-ra/tutorial/program_in_flash.rst

@@ -18,7 +18,7 @@ As the factory setting, following size is allocated for the file system:
 ---------------  -------------------
  EK-RA4M1           36KB ( 36864B)
  EK-RA4W1           64KB ( 65536B)
- EK-RA6M1          128KB (131072B)
+ EK-RA6M1           64KB ( 65536B)
  EK-RA6M2          128KB (131072B)
  RA4M1 CLICKER      36KB ( 36864B)
 ===============  ===================

ports/renesas-ra/boards/RA6M1_EK/ra6m1_ek.ld

@@ -5,8 +5,8 @@
 /* Linker script to configure memory regions. */
 MEMORY
 {
-  FLASH (rx)         : ORIGIN = 0x00000000, LENGTH = 0x00060000  /* 384KB/512KB */
-  FLASH_FS (r)       : ORIGIN = 0x00060000, LENGTH = 0x00020000  /* 128KB/512KB */
+  FLASH (rx)         : ORIGIN = 0x00000000, LENGTH = 0x00070000  /* 448KB/512KB */
+  FLASH_FS (r)       : ORIGIN = 0x00070000, LENGTH = 0x00010000  /* 64KB/512KB */
   RAM (rwx)          : ORIGIN = 0x1FFE0000, LENGTH = 0x00040000  /* 256KB */
   DATA_FLASH (rx)    : ORIGIN = 0x40100000, LENGTH = 0x00002000  /* 8KB */
   ID_CODE (rx)       : ORIGIN = 0x0100A150, LENGTH = 0x00000010  /* 32bytes */