lib/fonts: Allow Sparc console 8x16 font for sparc64 early boot text console

Allow FONT_SUN8x16 when EARLYFB is enabled for sparc64, even when
FRAMEBUFFER_CONSOLE is not to avoid the following warning for this case

   WARNING: unmet direct dependencies detected for FONT_SUN8x16
     Depends on [n]: FONT_SUPPORT [=y] && (FRAMEBUFFER_CONSOLE [=n] && (FONTS [=n] || SPARC [=y]) || BOOTX_TEXT)
     Selected by [y]:
     - EARLYFB [=y] && SPARC64 [=y]

by allowing it in the same manner as is done for powerpc in commit
0ebc7fea

 ("powerpc: Use shared font data").

Signed-off-by: Andreas Larsson <andreas@gaisler.com>
Fixes: 0f199194

 ("sparc: Use shared font data")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402241539.epQT43nI-lkp@intel.com/
Cc: "Dr. David Alan Gilbert" <linux@treblig.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Reviewed-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20240307180742.900068-1-andreas@gaisler.com