configs/sipeed_maix*sdcard: add missing quotes around string option

The build of those 4 defconfigs was failing in Gitlab CI as the
defconfig check doesn't pass, due to the BR2_TARGET_ROOTFS_EXT2_SIZE
string option value missing double quotes:

WARN: defconfig ./configs/sipeed_maixduino_sdcard_defconfig can't be used:
      Missing: BR2_TARGET_ROOTFS_EXT2_SIZE=64M

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/2812054080 (sipeed_maixduino_sdcard_defconfig)
  https://gitlab.com/buildroot.org/buildroot/-/jobs/2812054070 (sipeed_maix_go_sdcard_defconfig)
  https://gitlab.com/buildroot.org/buildroot/-/jobs/2812054049 (sipeed_maix_dock_sdcard_defconfig)
  https://gitlab.com/buildroot.org/buildroot/-/jobs/2812054037 (sipeed_maix_bit_sdcard_defconfig)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

configs/sipeed_maix_bit_sdcard_defconfig

@@ -36,7 +36,7 @@ BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config"
 # Filesystem
 BR2_INIT_NONE=y
 BR2_TARGET_ROOTFS_EXT2=y
-BR2_TARGET_ROOTFS_EXT2_SIZE=64M
+BR2_TARGET_ROOTFS_EXT2_SIZE="64M"
 BR2_ROOTFS_OVERLAY="board/canaan/k210-soc/rootfs_overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/canaan/k210-soc/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"

configs/sipeed_maix_dock_sdcard_defconfig

@@ -36,7 +36,7 @@ BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config"
 # Filesystem
 BR2_INIT_NONE=y
 BR2_TARGET_ROOTFS_EXT2=y
-BR2_TARGET_ROOTFS_EXT2_SIZE=64M
+BR2_TARGET_ROOTFS_EXT2_SIZE="64M"
 BR2_ROOTFS_OVERLAY="board/canaan/k210-soc/rootfs_overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/canaan/k210-soc/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"

configs/sipeed_maix_go_sdcard_defconfig

@@ -36,7 +36,7 @@ BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config"
 # Filesystem
 BR2_INIT_NONE=y
 BR2_TARGET_ROOTFS_EXT2=y
-BR2_TARGET_ROOTFS_EXT2_SIZE=64M
+BR2_TARGET_ROOTFS_EXT2_SIZE="64M"
 BR2_ROOTFS_OVERLAY="board/canaan/k210-soc/rootfs_overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/canaan/k210-soc/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"

configs/sipeed_maixduino_sdcard_defconfig

@@ -36,7 +36,7 @@ BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config"
 # Filesystem
 BR2_INIT_NONE=y
 BR2_TARGET_ROOTFS_EXT2=y
-BR2_TARGET_ROOTFS_EXT2_SIZE=64M
+BR2_TARGET_ROOTFS_EXT2_SIZE="64M"
 BR2_ROOTFS_OVERLAY="board/canaan/k210-soc/rootfs_overlay"
 BR2_ROOTFS_POST_BUILD_SCRIPT="board/canaan/k210-soc/post-build.sh"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"