configs/acmesystems_{aria,arietta}*: Linux kernel needs host-openssl

Since the bump of the Linux kernel version in the acmesystems
defconfigs in the following commits:

42ea31c1 configs/acmesystems_arietta_g25: bump Linux and AT91Bootstrap versions
ab10b5b3 configs/acmesystems_aria_g25: bump Linux and AT91Bootstrap versions

The Linux kernel configuration in use needs host-openssl to build
successfully. This commit therefore adds the necessary
BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y.

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/273673074 (acmesystems_arietta_g25_128mb_defconfig)
  https://gitlab.com/buildroot.org/buildroot/-/jobs/273673072 (acmesystems_aria_g25_128mb_defconfig)
  https://gitlab.com/buildroot.org/buildroot/-/jobs/273673075 (acmesystems_arietta_g25_256mb_defconfig)
  https://gitlab.com/buildroot.org/buildroot/-/jobs/273673073

 (acmesystems_aria_g25_256mb_defconfig)

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