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 <ju.o@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/pine64_star64_defconfig

@@ -24,6 +24,7 @@ BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
 BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="$(call github,Fishwaldo,u-boot,172b47f62039605d6806fa96bd403c21cda28996)/u-boot-172b47f62039605d6806fa96bd403c21cda28996.tar.gz"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="pine64_star64"
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
 BR2_TARGET_UBOOT_SPL=y
 
 # Misc