configs/pine64_star64: uboot needs openssl

configs/pine64_star64: uboot needs openssl

The defconfig fails in uboot build, with output:

    In file included from tools/imagetool.c:10:
    include/image.h:1178:12: fatal error: openssl/evp.h: No such file or directory
     1178 | #  include <openssl/evp.h>
          |            ^~~~~~~~~~~~~~~

This commit fixes the issue by adding
BR2_TARGET_UBOOT_NEEDS_OPENSSL=y to the defconfig.

Fixes:
- https://gitlab.com/buildroot.org/buildroot/-/jobs/6918689164

Signed-off-by: Julien Olivain <[email protected]>
Signed-off-by: Peter Korsgaard <[email protected]>