powerpc: Add check to select PPC_RADIX_BROADCAST_TLBIE

Commit 3d45a3d0 ("powerpc: Define config option for processors with broadcast TLBIE")
added a config option PPC_RADIX_BROADCAST_TLBIE to support processors with
broadcast TLBIE. Since this option is relevant only for RADIX_MMU, add
a check as a dependency to enable PPC_RADIX_BROADCAST_TLBIE in both
powernv and pseries configs. This fixes the unmet config dependency
warning reported

   WARNING: unmet direct dependencies detected for PPC_RADIX_BROADCAST_TLBIE
     Depends on [n]: PPC_RADIX_MMU [=n]
     Selected by [y]:
     - PPC_PSERIES [=y] && PPC64 [=y] && PPC_BOOK3S [=y]

Reported-by: kernel test robot <lkp@intel.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202504051857.jRqxM60c-lkp@intel.com/


Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250407084029.357710-1-maddy@linux.ibm.com