configs/armadeus_apf51: bump Linux version to 5.10.215

Since the switch to binutils 2.41 as default version [1], the arm Linux
kernel build is broken with:

  arch/arm/mm/proc-v7.S: Assembler messages:
  arch/arm/mm/proc-v7.S:640: Error: junk at end of line, first unrecognized character is `#'

A similar issue has already be fixed for qemu m68k [2].

Bump to the latest kernel 5.10 that already include the backport
of 790756c7e022 ("ARM: 8933/1: replace Sun/Solaris style flag on section directive")

Select BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y to fix the following
build error:

  scripts/extract-cert.c:21:25: fatal error: openssl/bio.h: No such file or directory
  #include <openssl/bio.h>

[1] e88225ed8820881970ec33de7a15a1e0d50443da
[2] a1ce9474e40f731f327035d8c0962abb16f00ff7

Fixes: https://gitlab.com/buildroot.org/buildroot/-/jobs/6655119389

Signed-off-by: Julien BOIBESSOT <julien.boibessot@armadeus.com>
[Romain:
  - improve commit log
  - Select BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL
]
Signed-off-by: Romain Naour <romain.naour@smile.fr>

configs/armadeus_apf51_defconfig

@@ -2,8 +2,8 @@
 BR2_arm=y
 BR2_cortex_a8=y
 
-# Linux headers same as kernel, a 4.4 series
-BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_4=y
+# Linux headers same as kernel, a 5.10 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_10=y
 
 # System
 BR2_TARGET_GENERIC_HOSTNAME="apf51"
@@ -13,13 +13,14 @@ BR2_TARGET_GENERIC_GETTY_PORT="ttymxc2"
 # Kernel
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_VERSION=y
-BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.4.291"
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.215"
 BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
-BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/armadeus/apf51/linux-4.4.config"
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/armadeus/apf51/linux-5.10.config"
 BR2_LINUX_KERNEL_UIMAGE=y
 BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x90008000"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="imx51-apf51dev"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 
 # Filesystem
 BR2_TARGET_ROOTFS_UBIFS=y