configs/octavo: Switch to Bootlin stable toolchain

Update the Octavo configurations to use the Bootlin glibc stable prebuilt
external toolchain, as recommended in the Buildroot meeting report from
ELCE 2024: https://elinux.org/Buildroot:DeveloperDaysELCE2024

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/octavo_osd32mp1_brk_defconfig

@@ -1,6 +1,8 @@
 BR2_arm=y
 BR2_cortex_a7=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_GLIBC_STABLE=y
 BR2_GLOBAL_PATCH_DIR="board/octavo/osd32mp1-brk/patches"
 BR2_ROOTFS_OVERLAY="board/octavo/osd32mp1-brk/overlay/"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"

configs/octavo_osd32mp1_red_defconfig

@@ -1,6 +1,8 @@
 BR2_arm=y
 BR2_cortex_a7=y
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARMV7_EABIHF_GLIBC_STABLE=y
 BR2_GLOBAL_PATCH_DIR="board/octavo/osd32mp1-red/patches"
 BR2_ROOTFS_OVERLAY="board/octavo/osd32mp1-red/overlay/"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"